mailscanner + exim release from out queue

[Martin Hepworth]

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


On 30 April 2013 08:49, Jonas Akrouh Larsen <jonas at vrt.dk> wrote:

>  Hi Glenn****
>
> ** **
>
> >That MailScanner doesn't operate at SMTP-time is exactly what sets it
> apart... It is the fundamental difference that make MailScanner perform so
> >much better, and suffer from so much less risk of DoS:ing, than amavisd ...
> ****
>
> >Sure, you cannot do "on the fly rejections", but ... AV/Anti-UCE scanning
> is to expensive at that stage anyway (IMO)... apart from the simple >things
> you can do in the MTA, that is (recipient verification, rfc strictness,
> graylisting etc). But the benefits of not doing it in one go, as amavisd
> >does, far outweigh that drawback.****
>
> >If one were to somehow wrangle MailScanner into action during SMTP... one
> could as well use amavisd instead;-).****
>
> >** **
>
> >As for choice of MTA, one should always stick with the one one is most
> comfortable with ... You're far less likely to foobar things if you know
> >what you're doing:-). If one starts from scratch, taking into account what
> happens to be the default on the system you use seem like a very sound
> >strategy:-).****
>
> ** **
>
> I’ve stuck with exim+MS for 5 years so I guess I must be liking it for the
> most part J****
>
> ** **
>
> However I do find it annoying not being able to scan at smtp time, it
> would be much simpler for bounces and such, and rid my outgoing queue of
> mails I can’t return to sender because it was forged etc.****
>
> ** **
>
> Also it shouldn’t run in parallel, so it’s no more expensive than running
> it post smtp, since you don’t spam scan a virus, you don’t virusscan
> something listed on rbl etc.****
>
> ** **
>
> But thanks for the comments J****
>
> ** **
>
> ** **
>
> Med venlig hilsen / Best regards****
>
>  ****
>
> Jonas Akrouh Larsen****
>
>  ****
>
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