SV: mailscanner + exim release from out queue

Jonas Akrouh Larsen jonas at
Tue Apr 30 14:04:23 IST 2013

Hi Martin

We do not bounce spam (since we do not deliver it), and we do validate recipients before accepting. However we scan for multiple backend systems. And let's say the system is down or unreachable we can't validate the recipient (since we do it live) and have to accept to be on the safe side.

However even ham generates bounces for a number of reasons. So while we keep the problem to a minimum (about 20-40 mails in the outgoing queue at any time, that can't be bounced/delivered) I do not think its too bad considering we have about 20k mails per day passing through our system (not counting greylisting mta rbl's etc)

Med venlig hilsen / Best regards

Jonas Akrouh Larsen

TechBiz ApS
Laplandsgade 4, 2. sal
2300 København S

Office: 7020 0979
Direct: 3336 9974
Mobile: 5120 1096
Fax:    7020 0978

Fra: mailscanner-bounces at [mailto:mailscanner-bounces at] På vegne af Martin Hepworth
Sendt: 30. april 2013 11:18
Til: MailScanner discussion
Emne: Re: mailscanner + exim release from out queue

don't bounce emails that are selected as spam, no reason to anyway.
Check for valid recipients on inbound at the MTA and use that to reject the connection, using a decent delay on initial connection and use greylisting are all easy reasons to reject at MTA.
But after that it can quite a job to process the email for spam/malware so doing post 'acceptance' is still fine IMHO

Martin Hepworth, CISSP
Oxford, UK

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