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Is there a way to force postfix to add a "Content-Transfer-Encoding" line to the header of DSN ("Delivery Status Notification") messages? May be some clients / Groupware systems (like zarafa) have problems if the "Content-Transfer-Encoding" was not set correctly (see also https://forums.zarafa.com/showthread.php?91-Fallback-delivery ). If I look in the header of the DNS message I cannot find a "Content-Transfer-Encoding" entry.

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  • Altermime might be a good choice, or possibly writing your own milter and using with the appropriate service.
    – NickW
    Feb 18, 2014 at 17:13

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It's in my case a bug in the currently newest zarafa version (ZCP 7.1.8-43801):

https://jira.zarafa.com/browse/ZCP-12019

According to zarafa the error is corrected in the next few days.

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