Notify Sender when a virus is detected

[Steve]

-------- Original-Nachricht --------
> Datum: Wed, 25 May 2011 14:54:17 +0200
> Von: Damien Robinet <damien at robinet.net>
> An: amavis-users at amavis.org
> Betreff: Re: Notify Sender when a virus is detected

> Hi Gary,
> 
> Not, it's not possible, because if you have a SMTP login to my server,
> I check if you use the good FROM.
> 
> I start my policy with that:
> if($attr{"sasl_username"} =~ /^[\w\.-_]+\@[\w\.-]+$/) {
> 
> One example of my rule:
>                 if($status == 0) {
>                         my $track1 = $mysql->prepare("SELECT domain
> FROM mail_rewrite WHERE domain = '\@$sender_from' AND goto =
> '\@$sender_domain'");
>                         $track1->execute();
>                         if(my $ref1 = $track1->fetchrow_hashref()) {
>                                 $status = 1;
>                         }
>                 }
> 
> And if the sender (from) are not allowed with the sasl login:
> $mysql->disconnect;
>                         return "reject Sender address $sender_from not
> owned by $sender_domain";
>                 }
> 
> If the sender match, i return "dunno".
> 
> I use my policy with the smtpd_end_of_data_restrictions of postfix :)
> 
Why so complicated when you can use a simple smtpd_sender_login_maps in Postfix directly?


> Regards,
> Damien
> 
> 2011/5/24 Gary V <mr88talent at gmail.com>:
> >
> > I think if it's a virus it could still fake sender address regardless
> > of whether it comes from trusted networks or authenticated clients. I
> > think if it is smart enough to be able to relay through your server,
> > it would at least be smart enough to attempt forging the sender
> > address. Same applies to spam or banned files that are created by
> > spambots/malware or whatever.
> >
> > --
> > Gary V
> >

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