Dear List
We use Postfix / Dovecot on our email plattform.
Lately I have started seeing more and more emails being accepted by
postfix, but then rejected by the local delivery agent dovecot with:
500 5.5.2 Invalid command
syntax (in reply to MAIL FROM command)
Looking at the headers, I see that the envelope sender contains 8 bit
characters, AFAIK against valid RFC. Example:
<Aloï[email protected]>
We use Postfix 3 but have NOT enabled SMTPUTF8 support. It's also not
advertised in the 'ehlo' reply.
So I wonder, why is postfix accepting sender email addresses with
invalid characters? I have tested with netcat, indeed 8bit chars are
being accepted.
We use MIMEDefang as a milter, so I could basically try filter 8bit
sender there, but I would rather use the built in mechanisms of
postfix, if such one exists.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
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