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We have 2 instances of qmail setup. The first instance is just a plain version of qmail which sucks in the email and then forwards it (using smtproutes) to a second instance using qmail-scanner to do my spam and virus scanning. This allows my users to send large emails and not have to wait for the large attachments to finish scanning before closing the SMTP session.
The problem I run into is when the user sends a single email to lots of recipients. When the first instance of qmail forwards the mail to the second instance of qmail instead of forwarding the email once, it creates a single SMTP session for every single recipient, which causes the 2nd instance of qmail to scan the same email many times, one for each recipient (creating quite a load!).
I understand that this is just the way qmail works (to allow VERPS), but is there some other way to get the first instance of qmail to send the email intact with all the recipients in the header so the second one only has to scan once? Do I have to go as far as using another MTA to replace the first instance of qmail?
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