How to prevent multiple scans on same email?

[Norman]

Hi List,

I have this conundrum which I am hoping the experts on here will help
me resolve. :)

How do I tell mailscanner not to rescan an email that it had already
scanned?

I have a small server set up with mailscanner, spamassassin, etc.
whose sole purpose is to process the inbound and outbound emails for a
separate mail server. The mail flows well between the mail server and
the mailscanner server. The issue I have is with 'forwarders', which
are, as all of you will know, essentially an email address that is set
up to forward incoming emails to another email address.

Briefly, an incoming email for a 'forwarder' first hits the
mailscanner server (being the primary mx), it gets processed for spam
and viruses and then handed to the mail server. The mail server sees
that the local address is not an email account but a 'forwarder', so
it sends the email back to the mailscanner server for processing and
distribution. That is fine. However, MailScanner treats the email on
the second pass as completely 'new' and scans it for spam and viruses
again, which is unneeded and causes unwanted resource usage.

Is it possible to tell mailscanner not to scan twiceby having it
evaluate the headers so it could see that itis dealing with an email
which it had already scanned? I couldn't find any optionsfor this in
the .conf file. The MTA on both servers is Exim, in case that may be
relevant.

Regards,

Norman
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