[PLUG] Postfix "Deferred"

[Richard Langis Jr.]

I believe you can set Postfix up to check to see if the domain from 
which the sender says he's coming from exists, and if it doesn't, to 
auto-reject the message.  Because obviously, if the domain doesn't 
exist, mail isn't EVER going to get back there.

Other checks could be to see if the address matches the initial 
sent-from domain/IP (but some people use from: headers that differ from 
sending domain for their own spam-avoidance reasons), if the netblock 
matches the domain, etc etc.

I had to switch email adresses at one point because I was getting so 
much spam.  I informed my friends, watched the logs and then set any 
mail to that address to REJECT, regardless of sender.

-R

Rich Shepard wrote:

>   I think that I have finally figured out that the deferrals are outgoing
> messages, not incoming. I get a lot of 'em, too. If these spam factories
> cannot be annoyed by receiving bounced/rejected messages they sent to us,
> then I would change the action from REJECT to IGNORE. According to
> /etc/postfix/main.cf, 
> 
> # IGNORE the header line is silently discarded.
> 
> which I interpret to mean that the message is slipped into /dev/null. If I'm
> wrong, then I, too, would like to know how to just throw away the rejections
> that are not received by the sender so I can save the bandwidth.
> 
> Rich



-- 
s u n  m i c r o s y s t e m s

   ~ Richard Langis Jr. ~
   richard.langis at sun.com