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MDaemon server breaks the Subject header
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When using the Thunderbird email client with the "Return Receipts" function enabled, "Customize return receipts for this account" with the "When sending messages, always request a return receipt" flag. In this case, the header "Disposition-Notification-To:" is added to the email. This header contains the full name and address of the mailbox. In the experiment, this header was present in the letter in the incoming queue, after switching to the local queue, it disappeared, the header consisted of two lines, in the letter in the local queue, the second line of this header joined the "Subject" heading. This happens exclusively when sending to mailing lists.
In inbound queue:
Subject: =?UTF-8?B?0L/RgNC+0LHQvdC+0LUg0L/QuNGB0YzQvNC+INC90LAg0L3QvtCy0YM=?=
=?UTF-8?B?0Y4g0L/QvtGH0YLQvtCy0YPRjiDQs9GA0YPQv9C/0YM=?=
Disposition-Notification-To: =?UTF-8?B?0KHQtdC80LXQvdC+0LLQsCDQkNC90L3QsCA=?=
=?UTF-8?B?0JLQuNC60YLQvtGA0L7QstC90LA=?= <user_name@domain.com>In local queue:
Subject: [sysadmins] =?UTF-8?B?0L/RgNC+0LHQvdC+0LUg0L/QuNGB0YzQvNC+INC90LAg0L3QvtCy0YM=?=
=?UTF-8?B?0Y4g0L/QvtGH0YLQvtCy0YPRjiDQs9GA0YPQv9C/0YM=?=
=?UTF-8?B?0JLQuNC60YLQvtGA0L7QstC90LA=?= <user_name@domain.com>I am ready to provide a content filter, there are no influencing rules, mail list settings, and so on.
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What version of MDaemon are you using? If you upgrade to MDaemon 25.5.2, does the problem continue?
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We have version 25.5.1 installed. And this situation has been going on for about two years now. Do you mean this fix?
- [28995] fix to MDaemon - jumbled From header in mailing list messages
Did the fixed issue affect the delivery notification lists specifically?
