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setup_with_postfix.md

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Running email2matrix on the same host as postfix

It's possible to run email2matrix on the same host with postfix. email2matrix can run on a loopback interface and postfix will forward the messges to email2matrix. This is a simple example what needs to be configured on email2matrix and postfix side to work together on one host.

Architecture

 Email sending system
   |
   |
   |          +--------------------+ 
   | SMTP 25  |                    |
   +--------> |     Postfix        |
              |        |           |
              | .......|.......... |                      +----------------------+
              |        |           |                      |                      |
              |        V           |  HTTPS (client API)  |   Matrix Homeserver  |
              |    email2matrix    |  ------------------> |    (e.g. Synapse)    |
              |                    |                      |                      |
              +--------------------+                      +----------------------+

Configuration

email2maitrix

Make sure you run email2matrix on a unused port. For example on port 2525. You can even run it on a lookback interface.

Example config (partly):

{
  "Smtp": {
    "ListenInterface": "127.0.0.1:2525",
    "Hostname": "email2matrix.example.com",
    "Workers": 10
  },
  "Matrix": ...

Postfix

  • Postfix needs to know that he is responsible for the domain
    • main.cf: mydestination = email2matrix.example.com, localhost
  • Set the transport maps on the destination domain
    • main.cf: transport_maps = hash:/etc/postfix/transport
    • transport email2matrix.example.com smtp:127.0.0.1:2525
      • create lookup db from plain file postmap transport (this creates transport.db)
  • Restart postfix
  • Look at /var/log/mail.log for errors