Removed long-deprecated features

* Message#register_for_delivery_notification,
* #has_transfer_encoding?,
* #add_transfer_encoding,
* #transfer_encoding,
* #message_content_type,
* #mime_parameters,
* #encode!, and
* Part#inline_content_id.

CHANGELOG.rdoc

@@ -2,6 +2,7 @@
 
 Breaking changes:
 * Passing unparsed headers to Mail::Field.new is no longer supported. Use Mail::Field.parse. (jeremy)
+* Removed long-deprecated features: Message#register_for_delivery_notification, #has_transfer_encoding?, #add_transfer_encoding, #transfer_encoding, #message_content_type, #mime_parameters, #encode!, and Part#inline_content_id. (jeremy)
 
 
 == Version 2.7.0 (2017-10-31)

lib/mail/message.rb

@@ -233,11 +233,6 @@ def self.default_charset; @@default_charset; end
     def self.default_charset=(charset); @@default_charset = charset; end
     self.default_charset = 'UTF-8'
 
-    def register_for_delivery_notification(observer)
-      warn("Message#register_for_delivery_notification is deprecated, please call Mail.register_observer instead")
-      Mail.register_observer(observer)
-    end
-
     def inform_observers
       Mail.inform_observers(self)
     end
@@ -1434,11 +1429,6 @@ def has_content_transfer_encoding?
       header[:content_transfer_encoding] && Utilities.blank?(header[:content_transfer_encoding].errors)
     end
 
-    def has_transfer_encoding? # :nodoc:
-      warn(":has_transfer_encoding? is deprecated in Mail 1.4.3.  Please use has_content_transfer_encoding?\n#{caller}")
-      has_content_transfer_encoding?
-    end
-
     # Creates a new empty Message-ID field and inserts it in the correct order
     # into the Header.  The MessageIdField object will automatically generate
     # a unique message ID if you try and encode it or output it to_s without
@@ -1496,26 +1486,11 @@ def add_content_transfer_encoding
       header[:content_transfer_encoding] ||= body.default_encoding
     end
 
-    def add_transfer_encoding # :nodoc:
-      warn(":add_transfer_encoding is deprecated in Mail 1.4.3.  Please use add_content_transfer_encoding\n#{caller}")
-      add_content_transfer_encoding
-    end
-
-    def transfer_encoding # :nodoc:
-      warn(":transfer_encoding is deprecated in Mail 1.4.3.  Please use content_transfer_encoding\n#{caller}")
-      content_transfer_encoding
-    end
-
     # Returns the MIME media type of part we are on, this is taken from the content-type header
     def mime_type
       has_content_type? ? header[:content_type].string : nil rescue nil
     end
 
-    def message_content_type
-      warn(":message_content_type is deprecated in Mail 1.4.3.  Please use mime_type\n#{caller}")
-      mime_type
-    end
-
     # Returns the character set defined in the content type field
     def charset
       if @header
@@ -1542,12 +1517,6 @@ def sub_type
       has_content_type? ? header[:content_type].sub_type : nil rescue nil
     end
 
-    # Returns the content type parameters
-    def mime_parameters
-      warn(':mime_parameters is deprecated in Mail 1.4.3, please use :content_type_parameters instead')
-      content_type_parameters
-    end
-
     # Returns the content type parameters
     def content_type_parameters
       has_content_type? ? header[:content_type].parameters : nil rescue nil
@@ -1816,11 +1785,6 @@ def ready_to_send!
       add_required_fields
     end
 
-    def encode!
-      warn("Deprecated in 1.1.0 in favour of :ready_to_send! as it is less confusing with encoding and decoding.")
-      ready_to_send!
-    end
-
     # Outputs an encoded string representation of the mail message including
     # all headers, attachments, etc.  This is an encoded email in US-ASCII,
     # so it is able to be directly sent to an email server.

lib/mail/part.rb

@@ -21,12 +21,6 @@ def has_content_id?
       header.has_content_id?
     end
 
-    def inline_content_id
-      # TODO: Deprecated in 2.2.2 - Remove in 2.3
-      warn("Part#inline_content_id is deprecated, please call Part#cid instead")
-      cid
-    end
-
     def cid
       add_content_id unless has_content_id?
       Utilities.uri_escape(Utilities.unbracket(content_id))

spec/mail/part_spec.rb

@@ -43,8 +43,6 @@
       body "This is Text"
     end
     expect(part.cid).to eq "thisis@acontentid"
-    expect($stderr).to receive(:puts).with("Part#inline_content_id is deprecated, please call Part#cid instead")
-    expect(part.inline_content_id).to eq "thisis@acontentid"
   end
 
 
@@ -54,15 +52,11 @@
       body "This is Text"
     end
     expect(part.cid).to eq "thi%25%25sis@acontentid"
-    expect($stderr).to receive(:puts).with("Part#inline_content_id is deprecated, please call Part#cid instead")
-    expect(part.inline_content_id).to eq "thi%25%25sis@acontentid"
   end
 
   it "should add a content_id if there is none and is asked for an inline_content_id" do
     part = Mail::Part.new
     expect(part.cid).not_to be_nil
-    expect($stderr).to receive(:puts).with("Part#inline_content_id is deprecated, please call Part#cid instead")
-    expect(part.inline_content_id).not_to be_nil
   end
 
   it "should respond correctly to inline?" do