[Gllug] Guarddog firewall question

[Chris Bell]

On Sun 11 Jun, Casper Gasper wrote:
> 
> >    SMTP delivery requires the destination to be open to receive mail as it
> > appears, which is generally not the case because only a relatively small
> > number of end users run their equipment 24/7. This means several retries,
> > and repeated server effort, to deliver the average email. Also junk mail and
> > other nasties are easily posted to an open port 25, so many ISPs allow their
> > customers to access their mail via something like POP3 but block SMTP port
> > 25 delivery. SMTP mail from their customers is not affected, the ISP does
> > aim to run 24/7 but not continually poll their customers via POP3.
> 
>   But the OP is not running a mail server, he's not accepting smtp
> mail delivery, just sending emails to his ISP's mail server, which
> happens to be running on tcp/2525.  In which case:
>  (a) he needs no entry to his INPUT chain, other than the standard one
> of accepting all ESTABLISHED traffic.
> 
>  (b) He needs to open up tc/2525 on his OUTPUT chain for NEW connections.
> 
> Casper.

   I read his original email as saying that he is trying to receive email
from an email provider that is not his ISP.
   The ISP has blocked port 25 so he has opened port 2525 for SMTP input
instead, and that is now working.

-- 
Chris Bell

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