Jeremy Kusnetz wrote:
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.
Quite understandable.
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 2^nd instance of qmail to scan the same email many times, one for each recipient (creating quite a load!).
Yup - that's the downside to Qmail in general.
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?No - unless you're willing to do silly things with serialmail. A different MTA would definitely work - but then I'd be remiss not to suggest that you look at replacing Qmail all together. I mean, if you have to change the frontend, why support two different MTAs?
I've never liked Qmail's lack of support for serializing mail deliveries... :-(
OTOH that feature allows other sites to do per-user configurations easily. If each message is guaranteed to have only one recipient, then you can much more extensively control delivery options.
-- Cheers
Jason Haar Information Security Manager, Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417 PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
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