exim.conf

######################################################################
#                  Runtime configuration file for Exim               #
######################################################################

### Created 27.2.2018, Karo
# update 5.6.2018 to add mysql connections, Karo

# Exim user and group
exim_group = mail

# Logging
# Default to /var/log/exim/%s.log
# this is CentOS default, ok

# Interfaces
# Defaults to 0.0.0.0

local_interfaces = 10.0.0.1 : 127.0.0.1

# ports to listen on (smtps is forced to use TLS/SSL via tls_on_connect_ports)
daemon_smtp_ports = smtp : smtps : submission

# Primary hostname

primary_hostname = mail.example.com

# Connections to MySQL database

hide mysql_servers = 127.0.0.1/database/user/password

# Domainlists

domainlist local_domains = @ : localhost : localhost.localdomain : example.com
domainlist relay_to_domains =
hostlist   relay_from_hosts = localhost

# SSL/TLS config
tls_advertise_hosts = *
tls_require_ciphers = AES : 3DES
tls_certificate = /etc/pki/tls/certs/exim.crt
tls_privatekey = /etc/pki/tls/private/exim.key

# additionally listen on ssl/smtp
tls_on_connect_ports = 465		

# log some details
log_selector = +tls_cipher +tls_peerdn \
+smtp_protocol_error +smtp_syntax_error 

### Define ACLs
### The names of these ACLs are:

acl_smtp_mail = acl_check_mail
acl_smtp_rcpt = acl_check_rcpt
acl_smtp_data = acl_check_data
acl_smtp_mime = acl_check_mime


# ClamAV and Spamassassin

av_scanner = clamd:/var/run/clamd.scan/clamd.sock

spamd_address = 127.0.0.1 783

## Some setting for spam and virus checking
# seconds after a greylisted message is accepted (1 minute)
GREYLIST_TIMEOUT = ${eval:1*60}

# integer spam score threshold to activate selective greylisting (2.0 points)
GREYLIST_SPAM_THRESHOLD = 20

# messages bigger than this aren't spam-scanned
SPAM_FILESIZE_LIMIT = 2M

# messages bigger than this aren't virus-scanned
VIRUS_FILESIZE_LIMIT = 10M


# Qualify domain and -recipient
qualify_domain = example.com

qualify_recipient = example.com

# Trigger guard
never_users = root

# DNS lookup
host_lookup = *

# accept 8-bit mime
accept_8bitmime = yes

# bounce queue duration
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d

# auth config
auth_advertise_hosts = ${if eq {$tls_cipher}{}{}{*}}

# The settings below cause Exim to make RFC 1413 (ident) callbacks
# for all incoming SMTP calls. You can limit the hosts to which these
# calls are made, and/or change the timeout that is used. If you set
# the timeout to zero, all RFC 1413 calls are disabled. RFC 1413 calls
# are cheap and can provide useful information for tracing problem
# messages, but some hosts and firewalls have problems with them.
# This can result in a timeout instead of an immediate refused
# connection, leading to delays on starting up SMTP sessions.
# (The default was reduced from 30s to 5s for release 4.61. and to
# disabled for release 4.86)
#
#rfc1413_hosts = *
#rfc1413_query_timeout = 5s


# Enable an efficiency feature.  We advertise the feature; clients
# may request to use it.  For multi-recipient mails we then can
# reject or accept per-user after the message is received.
#
prdr_enable = true

# If you're in a part of the world where ASCII is not sufficient for most
# text, then you're probably familiar with RFC2047 message header extensions.
# By default, Exim adheres to the specification, including a limit of 76
# characters to a line, with encoded words fitting within a line.
# If you wish to use decoded headers in message filters in such a way
# that successful decoding of malformed messages matters, you may wish to
# configure Exim to be more lenient.
#
# check_rfc2047_length = false
#
# In particular, the Exim maintainers have had multiple reports of problems
# from Russian administrators of issues until they disable this check,
# because of some popular, yet buggy, mail composition software.

keep_environment = ^LDAP
add_environment = PATH=/usr/bin::/bin

######################################################################
#                       ACL CONFIGURATION                            #
#         Specifies access control lists for incoming SMTP mail      #
######################################################################

begin acl


# This access control list is used for the MAIL command in an incoming
# SMTP message.

acl_check_mail:

  # Hosts are required to say HELO (or EHLO) before sending mail.
  # So don't allow them to use the MAIL command if they haven't
  # done so.

  deny condition = ${if eq{$sender_helo_name}{} {1}}
       message = Nice people say HELO first

  # Use the lack of reverse DNS to trigger greylisting. Some people
  # even reject for it but that would be a little excessive.

  warn condition = ${if eq{$sender_host_name}{} {1}}
       set acl_m_greylistreasons = Host $sender_host_address lacks reverse DNS\n$acl_m_greylistreasons

  accept



# This access control list is used for every RCPT command in an incoming
# SMTP message. The tests are run in order until the address is either
# accepted or denied.

acl_check_rcpt:

  # deny, if foreign, unauthenticated connection claims to come from a local domain
  # 2009-08-01   this has some strange behaviour (blocking) on two systems 
  # (A & B are different servers) with this config under the following condition
  # A: user@Adomain writes to user user@Bdomain (which is an alias for someotheruser@Adomain)

  deny    message = Sender claims to have a local address, but is neither authenticated nor relayed (try using SMTP-AUTH!)
          log_message = Forged Sender address (claims to be local user [${sender_address}], but isn't authenticated)
          !hosts          = +relay_from_hosts
          !authenticated  = *
          condition       = ${if match_domain{$sender_address_domain}{+local_domains}}

  # Accept if the source is local SMTP (i.e. not over TCP/IP). We do this by
  # testing for an empty sending host field.

  accept  hosts = :
          control = dkim_disable_verify

  deny    message       = Restricted characters in address
          domains       = +local_domains
          local_parts   = ^[.] : ^.*[@%!/|]

  deny    message       = Restricted characters in address
          domains       = !+local_domains
          local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./

  accept  local_parts   = postmaster
          domains       = +local_domains

  # Deny unless the sender address can be routed. For proper verification of the
  # address, read the documentation on callouts and add the /callout modifier.

  require verify        = sender

  # Accept if the message arrived over an authenticated connection, from
  # any host. Again, these messages are usually from MUAs, so recipient
  # verification is omitted, and submission mode is set. And again, we do this
  # check before any black list tests.

  accept  authenticated = *
          control       = submission/sender_retain
          control       = dkim_disable_verify

  # Note that, by putting this test before any DNS black list checks, you will
  # always accept from these hosts, even if they end up on a black list. The
  # assumption is that they are your friends, and if they get onto a black
  # list, it is a mistake.

  accept  hosts         = +relay_from_hosts
          control       = submission
          control       = dkim_disable_verify

  deny	message		= rejected because $sender_host_address is in blacklist at $dnslist_domain \n$dnslist_text
	dnslists	= zen.spamhaus.org


  # Insist that a HELO/EHLO was accepted.

  require message	= nice hosts say HELO first
          condition	= ${if def:sender_helo_name}

### --- centos way ---
  # Insist that any other recipient address that we accept is either in one of
  # our local domains, or is in a domain for which we explicitly allow
  # relaying. Any other domain is rejected as being unacceptable for relaying.

#  require message = relay not permitted
#          domains = +local_domains : +relay_to_domains

  # We also require all accepted addresses to be verifiable. This check will
  # do local part verification for local domains, but only check the domain
  # for remote domains. The only way to check local parts for the remote
  # relay domains is to use a callout (add /callout), but please read the
  # documentation about callouts before doing this.

#  require verify = recipient

  # At this point, the address has passed all the checks that have been
  # configured, so we accept it unconditionally.

#  accept
### --- centos way ---

### --- same thing in different way ---

  accept  domains       = +local_domains
          endpass
          verify        = recipient

  accept  domains       = +relay_to_domains
          endpass
          verify        = recipient

  deny    message       = we are not an open relay.



# This ACL is used after the contents of a message have been received. This
# is the ACL in which you can test a message's headers or body, and in
# particular, this is where you can invoke external virus or spam scanners.
# Some suggested ways of configuring these tests are shown below, commented
# out. Without any tests, this ACL accepts all messages. If you want to use
# such tests, you must ensure that Exim is compiled with the content-scanning
# extension (WITH_CONTENT_SCAN=yes in Local/Makefile).

acl_check_data:

  # Deny if the message contains an overlong line.  Per the standards
  # we should never receive one such via SMTP.
  #
  deny    message    = maximum allowed line length is 998 octets, \
                       got $max_received_linelength
          condition  = ${if > {$max_received_linelength}{998}}

  # Put simple tests first. A good one is to check for the presence of a
  # Message-Id: header, which RFC2822 says SHOULD be present. Some broken
  # or misconfigured mailer software occasionally omits this from genuine
  # messages too, though -- although it's not hard for the offender to fix
  # after they receive a bounce because of it.
  #
  # deny    condition  = ${if !def:h_Message-ID: {1}}
  #         message    = RFC2822 says that all mail SHOULD have a Message-ID header.\n\
  #                      Most messages without it are spam, so your mail has been rejected.
  #
  # Alternatively if we're feeling more lenient we could just use it to
  # trigger greylisting instead:

  warn    condition  = ${if !def:h_Message-ID: {1}}
          set acl_m_greylistreasons = Message lacks Message-Id: header. Consult RFC2822.\n$acl_m_greylistreasons

  # Deny if the message contains a virus. Before enabling this check, you
  # must install a virus scanner and set the av_scanner option above.
  #
  
  deny  message    = This message contains a virus ($malware_name).
   	log_message = rejected a message containing malware ($malware_name) from $sender_address to $recipients (ClamAV)
    	condition = ${if < {$message_size}{VIRUS_FILESIZE_LIMIT}}
    	# demime = *
	malware = */defer_ok

  # Bypass SpamAssassin checks if the message is too large.
  #
  accept  condition  = ${if >= {$message_size}{SPAM_FILESIZE_LIMIT}}
          add_header = X-Spam-Note: SpamAssassin run bypassed due to message size
#  accept  condition  = ${if !def:spam_score_int {1}}
#          add_header = X-Spam-Note: SpamAssassin invocation failed
 
  # Run SpamAssassin, but allow for it to fail or time out. Add a warning message
  # and accept the mail if that happens. Add an X-Spam-Flag: header if the SA
  # score exceeds the SA system threshold.
  #
# Add spam score to all messages, (:true)

  # Deny condition rewritten to here (25.3.2018, karo)
  # Ordering of clauses is important!
  ### deny message
  ### spam = user
  ### conditions
  deny	message = This message scored over $spam_score spampoints. Congratulations!
	spam = spamassassin:true/defer_ok
	condition = ${if < {$message_size}{SPAM_FILESIZE_LIMIT}}
 	condition = ${if > {$spam_score_int}{100} {1}}
#	hosts = !wildlsearch:/etc/exim/domain_whitelist.txt

  warn  message = X-Spam-Score: $spam_score
	spam = spamassassin:true/defer_ok
#  Spam report moved to spam messages. ~karo, 1.1.11
#  warn  message = X-Spam-Score: $spam_score\n\
#                  X-Spam-Report: $spam_report
    !authenticated = *
    condition      = ${if < {$message_size}{SPAM_FILESIZE_LIMIT}}

# Add spam flag to spam messages
  warn  message = X-Spam-Flag: YES\n\
		  X-Spam-Report: $spam_report
	spam = spamassassin/defer_ok
	!authenticated = *
	condition      = ${if < {$message_size}{SPAM_FILESIZE_LIMIT}}

# Deny messages scoring over 10 spampoints
#  deny  message = This message scored $spam_score spampoints. Congratulations!
#    spam = nobody:true/defer_ok
#    condition = ${if >{$spam_score_int}{100}{1}{0}}
#    hosts = ! wildlsearch;/etc/exim/domain_whitelist.txt

#  accept


  # Trigger greylisting (if enabled) if the SpamAssassin score is greater than (0.5)??
  #
  warn    condition = ${if > {$spam_score_int}{25} {1}}
          set acl_m_greylistreasons = Message has $spam_score SpamAssassin points\n$acl_m_greylistreasons


  # If you want to greylist _all_ mail rather than only mail which looks like there
  # might be something wrong with it, then you can do this...
  #
  # warn set acl_m_greylistreasons = We greylist all mail\n$acl_m_greylistreasons

  # Now, invoke the greylisting. For this you need to have installed the exim-greylist
  # package which contains this subroutine, and you need to uncomment the bit below
  # which includes it too. Whenever the $acl_m_greylistreasons variable is non-empty,
  # greylisting will kick in and will defer the mail to check if the sender is a
  # proper mail which which retries, or whether it's a zombie. For more details, see
  # the exim-greylist.conf.inc file itself.
  #
  require acl = greylist_mail

  accept

# To enable the greylisting, also uncomment this line:
.include /etc/exim/exim-greylist.conf.inc

acl_check_mime:

  # File extension filtering.
  deny message = Blacklisted file extension detected
       condition = ${if match \
                        {${lc:$mime_filename}} \
                        {\N(\.exe|\.pif|\.bat|\.scr|\.lnk|\.com)$\N} \
                     {1}{0}}

  accept


######################################################################
#                      ROUTERS CONFIGURATION                         #
#               Specifies how addresses are handled                  #
######################################################################
#     THE ORDER IN WHICH THE ROUTERS ARE DEFINED IS IMPORTANT!       #
# An address is passed to each router in turn until it is accepted.  #
######################################################################

begin routers

# This router routes to remote hosts over SMTP by explicit IP address,
# when an email address is given in "domain literal" form, for example,
# <user@[192.168.35.64]>. The RFCs require this facility. However, it is
# little-known these days, and has been exploited by evil people seeking
# to abuse SMTP relays. Consequently it is commented out in the default
# configuration. If you uncomment this router, you also need to uncomment
# allow_domain_literals above, so that Exim can recognize the syntax of
# domain literal addresses.

# domain_literal:
#   driver = ipliteral
#   domains = ! +local_domains
#   transport = remote_smtp


# This router routes addresses that are not in local domains by doing a DNS
# lookup on the domain name. The exclamation mark that appears in "domains = !
# +local_domains" is a negating operator, that is, it can be read as "not". The
# recipient's domain must not be one of those defined by "domainlist
# local_domains" above for this router to be used.
#
# If the router is used, any domain that resolves to 0.0.0.0 or to a loopback
# interface address (127.0.0.0/8) is treated as if it had no DNS entry. Note
# that 0.0.0.0 is the same as 0.0.0.0/32, which is commonly treated as the
# local host inside the network stack. It is not 0.0.0.0/0, the default route.
# If the DNS lookup fails, no further routers are tried because of the no_more
# setting, and consequently the address is unrouteable.

dnslookup:
  driver = dnslookup
  domains = ! +local_domains
  transport = remote_smtp
  ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
# if ipv6-enabled then instead use:
# ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
  no_more


# This alternative router can be used when you want to send all mail to a
# server which handles DNS lookups for you; an ISP will typically run such
# a server for their customers.  If you uncomment "smarthost" then you
# should comment out "dnslookup" above.  Setting a real hostname in route_data
# wouldn't hurt either.

# smarthost:
#   driver = manualroute
#   domains = ! +local_domains
#   transport = remote_smtp
#   route_data = MAIL.HOSTNAME.FOR.CENTRAL.SERVER.EXAMPLE
#   ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
#   no_more


# The remaining routers handle addresses in the local domain(s), that is those
# domains that are defined by "domainlist local_domains" above.


# This router handles aliasing using a linearly searched alias file with the
# name SYSTEM_ALIASES_FILE. When this configuration is installed automatically,
# the name gets inserted into this file from whatever is set in Exim's
# build-time configuration. The default path is the traditional /etc/aliases.
# If you install this configuration by hand, you need to specify the correct
# path in the "data" setting below.
#
##### NB  You must ensure that the alias file exists. It used to be the case
##### NB  that every Unix had that file, because it was the Sendmail default.
##### NB  These days, there are systems that don't have it. Your aliases
##### NB  file should at least contain an alias for "postmaster".
#
# If any of your aliases expand to pipes or files, you will need to set
# up a user and a group for these deliveries to run under. You can do
# this by uncommenting the "user" option below (changing the user name
# as appropriate) and adding a "group" option if necessary. Alternatively, you
# can specify "user" on the transports that are used. Note that the transports
# listed below are the same as are used for .forward files; you might want
# to set up different ones for pipe and file deliveries from aliases.

system_aliases:
  driver = redirect
  allow_fail
  allow_defer
  data = ${lookup{$local_part}lsearch{/etc/aliases}}
  file_transport = address_file
  pipe_transport = address_pipe

virtual_alias:
  driver = redirect
  allow_fail
  allow_defer
  data = ${lookup mysql{\
		SELECT CONCAT(username, '@', domain)\
			FROM alias \
			WHERE alias='${quote_mysql:$local_part}'\
			AND domain='${quote_mysql:$domain}'}}

# This router handles forwarding using traditional .forward files in users'
# home directories. If you want it also to allow mail filtering when a forward
# file starts with the string "# Exim filter" or "# Sieve filter", uncomment
# the "allow_filter" option.

# The no_verify setting means that this router is skipped when Exim is
# verifying addresses. Similarly, no_expn means that this router is skipped if
# Exim is processing an EXPN command.

# If you want this router to treat local parts with suffixes introduced by "-"
# or "+" characters as if the suffixes did not exist, uncomment the two local_
# part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
# in the same way as xxxx@your.domain by this router. Because this router is
# not used for verification, if you choose to uncomment those options, then you
# will *need* to make the same change to the localuser router.  (There are
# other approaches, if this is undesirable, but they add complexity).

# The check_ancestor option means that if the forward file generates an
# address that is an ancestor of the current one, the current one gets
# passed on instead. This covers the case where A is aliased to B and B
# has a .forward file pointing to A.

# The three transports specified at the end are those that are used when
# forwarding generates a direct delivery to a file, or to a pipe, or sets
# up an auto-reply, respectively.

userforward:
  driver = redirect
  check_local_user
# local_part_suffix = +* : -*
# local_part_suffix_optional
  file = $home/.forward
  allow_filter
  no_verify
  no_expn
  check_ancestor
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply

procmail:
  driver = accept
  check_local_user
  require_files = ${local_part}:+${home}/.procmailrc:/usr/bin/procmail
  transport = procmail
  no_verify

# This router matches local user mailboxes. If the router fails, the error
# message is "Unknown user".

# If you want this router to treat local parts with suffixes introduced by "-"
# or "+" characters as if the suffixes did not exist, uncomment the two local_
# part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
# in the same way as xxxx@your.domain by this router.

localuser:
  driver = accept
  check_local_user
# local_part_suffix = +* : -*
# local_part_suffix_optional
  transport = local_delivery
  cannot_route_message = Unknown user

# Router for virtual user delivery
# query database for user and deliver to proper transport

virtualuser:
  driver 	= accept
  condition	= ${lookup mysql {\
			SELECT CONCAT(username, '@', domain)\
			FROM user \
			WHERE username='${quote_mysql:$local_part}'\
			AND domain='${quote_mysql:$domain}'}}
  domains	= +local_domains
  transport	= virtual_user


######################################################################
#                      TRANSPORTS CONFIGURATION                      #
######################################################################
#                       ORDER DOES NOT MATTER                        #
#     Only one appropriate transport is called for each delivery.    #
######################################################################

# A transport is used only when referenced from a router that successfully
# handles an address.

begin transports


# This transport is used for delivering messages over SMTP connections.
# Refuse to send any message with over-long lines, which could have
# been received other than via SMTP. The use of message_size_limit to
# enforce this is a red herring.

remote_smtp:
  driver = smtp
  message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}

# This transport is used for delivering messages over SMTP using the
# "message submission" port (RFC4409).

remote_msa:
  driver = smtp
  port = 587
  hosts_require_auth = *
# hosts_require_auth = ${if eq {$interface_port}{587}{*}{}}

# This transport invokes procmail to deliver mail
procmail:
  driver = pipe
  command = "/usr/bin/procmail -d $local_part"
  return_path_add
  delivery_date_add
  envelope_to_add
  user = $local_part
  initgroups
  return_output

# This transport is used for local delivery to user mailboxes in traditional
# BSD mailbox format. By default it will be run under the uid and gid of the
# local user, and requires the sticky bit to be set on the /var/mail directory.
# Some systems use the alternative approach of running mail deliveries under a
# particular group instead of using the sticky bit. The commented options below
# show how this can be done.

local_delivery:
  driver = appendfile
#  file = /var/mail/$local_part
  directory = /home/$local_part/.maildir
  maildir_format
  delivery_date_add
  envelope_to_add
  return_path_add
#  group = mail
#  mode = 0660

virtual_user:
  driver = appendfile
  maildir_format
  delivery_date_add
  envelope_to_add
  return_path_add
  # this is stupid. Rewrite with $address_data = ${lookup mysql{SELECT uid,gid,home}} in router, then
  # user = ${extract{uid}{$address_data}}
  # to make all this with single sql query
  group = ${lookup mysql {\
		SELECT gid \
		FROM user \
		WHERE username='${quote_mysql:$local_part}'\
		AND domain='${quote_mysql:$domain}'}}
  user = ${lookup mysql {\
		SELECT uid \
		FROM user \
		WHERE username='${quote_mysql:$local_part}'\
		AND domain='${quote_mysql:$domain}'}}
  directory = ${lookup mysql {\
		SELECT home \
		FROM user \
		WHERE username='${quote_mysql:$local_part}'\
		AND domain='${quote_mysql:$domain}'}}/.maildir
		


# This transport is used for handling pipe deliveries generated by alias or
# .forward files. If the pipe generates any standard output, it is returned
# to the sender of the message as a delivery error. Set return_fail_output
# instead of return_output if you want this to happen only when the pipe fails
# to complete normally. You can set different transports for aliases and
# forwards if you want to - see the references to address_pipe in the routers
# section above.

address_pipe:
  driver = pipe
  return_output


# This transport is used for handling deliveries directly to files that are
# generated by aliasing or forwarding.

address_file:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  return_path_add


# This transport is used for handling autoreplies generated by the filtering
# option of the userforward router.

address_reply:
  driver = autoreply


# This transport is used to deliver local mail to cyrus IMAP server via UNIX
# socket. You'll need to configure the 'localuser' router above to use it.
#
#lmtp_delivery:
#  home_directory = /var/spool/imap
#  driver = lmtp
#  command = "/usr/lib/cyrus-imapd/deliver -l"
#  batch_max = 20
#  user = cyrus


######################################################################
#                      RETRY CONFIGURATION                           #
######################################################################

begin retry

# This single retry rule applies to all domains and all errors. It specifies
# retries every 15 minutes for 2 hours, then increasing retry intervals,
# starting at 1 hour and increasing each time by a factor of 1.5, up to 16
# hours, then retries every 6 hours until 4 days have passed since the first
# failed delivery.

# WARNING: If you do not have any retry rules at all (this section of the
# configuration is non-existent or empty), Exim will not do any retries of
# messages that fail to get delivered at the first attempt. The effect will
# be to treat temporary errors as permanent. Therefore, DO NOT remove this
# retry rule unless you really don't want any retries.

# Address or Domain    Error       Retries
# -----------------    -----       -------

*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h



######################################################################
#                      REWRITE CONFIGURATION                         #
######################################################################

# There are no rewriting specifications in this default configuration file.

begin rewrite



######################################################################
#                   AUTHENTICATION CONFIGURATION                     #
######################################################################

begin authenticators

# This authenticator supports CRAM-MD5 username/password authentication
# with Exim acting as a _client_, as it might when sending its outgoing
# mail to a smarthost rather than directly to the final recipient.
# Replace SMTPAUTH_USERNAME and SMTPAUTH_PASSWORD as appropriate.

#client_auth:
#  driver = cram_md5
#  public_name = CRAM-MD5
#  client_name = SMTPAUTH_USERNAME
#  client_secret = SMTPAUTH_PASSWORD

#

# The following authenticators support plaintext username/password
# authentication using the standard PLAIN mechanism and the traditional
# but non-standard LOGIN mechanism, with Exim acting as the server.
# PLAIN and LOGIN are enough to support most MUA software.
#
# These authenticators are not complete: you need to change the
# server_condition settings to specify how passwords are verified.
# They are set up to offer authentication to the client only if the
# connection is encrypted with TLS, so you also need to add support
# for TLS. See the global configuration options section at the start
# of this file for more about TLS.
#
# The default RCPT ACL checks for successful authentication, and will accept
# messages from authenticated users from anywhere on the Internet.

#

# PLAIN authentication has no server prompts. The client sends its
# credentials in one lump, containing an authorization ID (which we do not
# use), an authentication ID, and a password. The latter two appear as
# $auth2 and $auth3 in the configuration and should be checked against a
# valid username and password. In a real configuration you would typically
# use $auth2 as a lookup key, and compare $auth3 against the result of the
# lookup, perhaps using the crypteq{}{} condition.

#PLAIN:
#  driver                     = plaintext
#  server_set_id              = $auth2
#  server_prompts             = :
#  server_condition           = ${if saslauthd{{$2}{$3}{smtp}} {1}}
#  server_advertise_condition = ${if def:tls_in_cipher }

# LOGIN authentication has traditional prompts and responses. There is no
# authorization ID in this mechanism, so unlike PLAIN the username and
# password are $auth1 and $auth2. Apart from that you can use the same
# server_condition setting for both authenticators.

#LOGIN:
#  driver                     = plaintext
#  server_set_id              = $auth1
#  server_prompts             = <| Username: | Password:
#  server_condition           = ${if saslauthd{{$1}{$2}{smtp}} {1}}
#  server_advertise_condition = ${if def:tls_in_cipher }

dovecot_plain:
  driver = dovecot
  public_name = PLAIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1

dovecot_login:
  driver = dovecot
  public_name = LOGIN
  server_socket = /var/run/dovecot/auth-client
# setting server_set_id might break several headers in mails sent by authenticated smtp. be careful.
  server_set_id = $auth1


######################################################################
#                   CONFIGURATION FOR local_scan()                   #
######################################################################

# If you have built Exim to include a local_scan() function that contains
# tables for private options, you can define those options here. Remember to
# uncomment the "begin" line. It is commented by default because it provokes
# an error with Exim binaries that are not built with LOCAL_SCAN_HAS_OPTIONS
# set in the Local/Makefile.

# begin local_scan


# End of Exim configuration file