Handle comma separated Message IDs

Many mailers in the wild will use comma-separated lists of message IDs in the References field. Closes #606
mikel · Nov 2, 2017 · 714e429 · 714e429
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diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
@@ -4,6 +4,9 @@ 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)
 
+Compatibility:
+* Support nonstandard comma-separated lists of message IDs in the References field. (peterkovacs)
+
 
 == Version 2.7.0 (2017-10-31)