On Fri, Oct 24, 2008 at 07:24:30AM +0200, Tomáš Macek wrote:
> John Andersen wrote:
> > Tomáš Macek wrote:
> > 
> >> What do I want:
> >> I want to check all the emails including the ones being send between 
> >> computers inside @mynetwork. Only when mail goes outside of 
> >> @mynetwork, it shouldn't be checked.
> > 
> > 
> > Unless your network sends tons of spam, the outbound mail is the
> > smallest segment of mail.
> > 
> > Why skip this mail?  You will save very little and you run the risk
> > of becoming a bad internet citizen if your machines get a virus or a 
> > spambot.
> > 
> 
> OK, I will think about it, maybe you are right. But I have my own 
> program (it's not well know 'policyd') in smtpd_client_restrictions 
> checking out the rate of the mails being sent from the client machine 
> - it works fine.
> In the beginning of this week I had one client, that sent normal email 
> from the windows matchine from his MS Oulook Express and this was 
> false positive with FORGET_MUA_OUTLOOK and DCC_CHECK (and some other 
> rules) and this was dropped by Amavis and I think there is more of 
> these cases, that I don't know about. So that's why I tried to find a 
> solution.

Why don't you make amavisd-new notify you when spam/virus is sent from
mynetworks? Problem solved. Optionally you can also bounce to the sender.
Or you can just silently release FPs and not bother users.

At minimum use ClamAV with Sanesecurity for outgoing messages. You are
pretty safe then, I don't know if SA adds much benefits after it.


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