Reasons behind defaulting atd and sendmail

Mikkel L. Ellertson mikkel at infinity-ltd.com
Fri Sep 5 14:56:12 UTC 2008


Mike Cronenworth wrote:
> 
> You cannot send mail to the LAN. By default sendmail is only able to
> accept email from 127.0.0.1. Plus, Fedora's default iptables rules do
> not include port 25. You would have to do quite a bit of extra
> configuration work to send messages between Fedora boxes on a LAN. The
> point is moot.
> 
> Mike
> 
The rules are for incoming port 25 connections, not outgoing port 25
connections. The port on the local machine for the outgoing
connection is not going to be port 25. As far as changing the
firewall to allow incoming port 25 connections, it is a checkbox on
the default firewall GUI that will open the connection. If your ISP
is not blocking outgoing port 25 connections, except to their mail
server, the stock setup of Sendmail will send mail to the Internet.
It takes a bit more configuration to use your ISPs mail server, but
not much.

If you have a mail server on your LAN, you can configure Sendmail to
use it without much trouble. It is also not that hard to configure
Sendmail to accept incoming connections. All it takes is editing or
removing one line, and regenerating the config file. Or if you are
brave, you can edit the config file directly. The change is fairly easy.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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