What works fine for me is to do this checks just before calling
SpamAssassin and add the result as headers to the mail that SpamAssassin
checks.
This way I can have SpamAssassin rules scoring for things that looks like
dynamic or dul hostnames. So a dynamic looking host name in itself won't
stop a mail from beeing received, but it will increase the likelyhood of
the mail beeing rejected.
(This kind of thing is why I patched mimedefang.pl so I can add my own
headers to SpamAssassins input.)
Jonas:
This mirrors my choice of implementation as well.
Regards,
KAM
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