On 28/04/23 21:19, Andreas Cieslak via Postfix-users wrote:
Why are To and From replaced in the header but not the subject?
Am I perhaps missing the right expression here and could someone give me
some advice?
Or is there really no way around Mailmunge or MimeDefang etc.?
Any hints would be appreciated.
Others have already answered this. header_checks operates on only ONE
HEADER AT A TIME. If you match the To: header then the REPLACE
operation replaces the To: header with whatever you put in the
replacement text, so when you are trying to replace the Subject header
you are literally replacing the To: header in the message with a second
Subject: line thereby resulting in a message with no To: header and two
Subject: headers. The way that this is treated in the email client is
very much undefined.
The only way to accomplish what you want is with either a milter or a
content filter.
Peter
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