[Trilug-ontopic] Email servers

Neil L. Little nllittle at embarqmail.com
Fri Oct 5 22:27:41 EDT 2007

Ok, a month later he (myself) has gotten the Postfix server up. I have 
been working from the documents off the Postfix.org site and the Howtos 
off the Ubuntuforums.org site.

The install went well and I was immediately able to telenet on port 25 
and connect to the Postfix server. I have been working to make sure 
that only the machines on my local network can submit mail (mynetworks) 
and only the users I have specified (relay_recipient_maps)can send mail. 
That is a little paranoia that originates from last year when I 
discovered that my first server was a porn spamming zombie.

The trouble is I think I gone overboard and have the thing locked down 
so tight I cant even send mail out ... well sorta.
The local mail I am able to send does this fine. Mail leaves the machine 
with the specified domain address (myorigin). The mail generated from 
the cisco box gets bounced.

What the logs are telling me that the local user does not exist (the 
sender) and the server bounces the traffic. I think that the trouble 
may lie with the myorigin or the mydestination parameters. I dont 
think that I quite understand how they work. Of course there is the 
thing about the rewriting address and restricting recipients, aliases, 
getting the domain address to appear like I want it ... and a dozen other 

Of course I need to show what exactly the mail logs were saying and how my main.cf is set.
Yes, have to remember to get those.


Neil Little, WA4AZL
JARS Forever!!

Neil L. Little wrote:

> Yes, port 25 will only accept traffic from the IP address of the Cisco box.
> Daniel Bartholomew wrote:
> >/ On Thu, 2007-08-23 at 21:50 -0400, Neil L. Little wrote:
> />/   
> />>/ I have to setup an SMTP server who's sole purpose will be to relay email 
> />>/ from a (Cisco) Media Convergence Server to the outer world.
> />>/ I am wondering which would be the most efficient to use (setup, config, 
> />>/ secure from spammers turning it into a zombie and spreading porn to the 
> />>/ world).
> />>/ I have been exposed to Sendmail in the past and it was not a positive one.
> />>/ A spammer turned my server into a zombie, spreading porn spam to the world.
> />>/
> />>/ The distribution is Ubuntu (edgy elf)
> />>/     
> />/
> />/
> />/ Postfix or Exim are good alternatives.
> />/
> />/ As far as locking the server down, is this server going to be only
> />/ sending mail and not receiving any (except from the Cisco box)? If so,
> />/ set up iptables to block all inbound traffic on port 25 except from the
> />/ Cisco box./
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