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<blockquote type="cite"
cite="mid:ddcc9fdf-ca09-456b-881e-cf65f0776475@howitts.co.uk">Thanks
very much. I had tried adding "-o
content_filter=smtp-amavis:[127.0.0.1]:10024" to master.cf but
only reloaded postfix. I removed it when it didn't work.
</blockquote>
<p>Are you sure about the 10024? That is the standard Amavis port.
If you use the same port for externally inbound emails, they will
be falsely declared as originating.<br>
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