[Dovecot] anti-spam+anti-malware suggestions

[Denny Lin]

On Thu, Oct 21, 2010 at 09:26:46AM -0400, Charles Marcus wrote:
> On 2010-10-20 10:18 PM, Denny Lin wrote:
> > Postfix's address verification is also quite useful for popular domains
> > like gmail.com, hotmail.com, yahoo.com, etc.
> 
> If you mean you are using *sender* address verification on these
> domains, you will eventually get blacklisted by them if your system has
> much traffic from them. Most Mail Admins consider blanket SAV as an
> abuse of their systems.
> 
> SAV (sender address verification) should be used sparingly, and only
> with domains/systems that are ok with you using it.

Oh yeah, I forgot to mention that. A better solution would be to check
the rDNS or SPF record and do sender verification if it doesn't match.

-- 
Denny Lin