[Users] [Bug 3828] New: "Re-edit" should not recycle the Message-ID header

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3828

            Bug ID: 3828
           Summary: "Re-edit" should not recycle the Message-ID header
    Classification: Unclassified
           Product: Claws Mail
           Version: 3.14.1
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Other
          Assignee: users at lists.claws-mail.org
          Reporter: psychonaut at nothingisreal.com

The Message->Re-edit command allows the user to open a new copy of a sent
message so that it can be edited and sent again.  The copy preserves the
headers from the original message, which is generally a good thing.  But one
header it should *not* preserve is the Message-ID field, as this violates the
uniqueness requirements of RFC 2392, RFC 5322, etc., and in turn can interfere
with the storage, retrieval, and presentation of messages in mail clients and
other mail processing software.

For example, in Thread View, Claws Mail itself gets confused by duplicate
Message-IDs, anchoring the reply tree at only one of the messages.  (This is
particularly noticeable when using "Re-edit" to send messages to a mailing list
that you subscribe to.)  More seriously, having substantially different
messages with duplicate Message-IDs can lead to data loss when running Claws
Mail's duplicate filter, which checks only the Message-ID header and not the
message content.

Steps to reproduce:
1. Navigate to a "Sent" folder and select a message.
2. Message->Re-edit
3. Edit the message content and/or headers
4. Message->Send
5. Using View->"Show All Headers" or View->"Message Source", examine the
"Message-ID" header of the original and "re-edited" messages.

Observed behaviour:
6. The Message-IDs are the same.

Expected behaviour:

6. The Message-ID for the "re-edited" message should be different.

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