Re: Setting up Postfix in SUSE 9.1

vmkbg_at_ofmprt.com
Date: 08/05/04 

Date: Thu, 05 Aug 2004 10:26:48 GMT

|I have my own domain and want to run a mail server from it and
|retrieve mail from that machine using Thunderbird (POP3). Because of
|this, I would need this, wouldn't I?

Not enough information, mail server is not precise enough, nor is having
your own domain.

Postfix talks SMTP, which is for mail from the user agent to the mail
server. Postfix DOES NOT talk POP3. Popper talks POP3, which is for
mail from the mail server to the user agent, using POP. An alternative
protocol to POP3 is IMAP. It's confusing that there are different
protocols for UA outgoing and UA incoming, but there it is, that's
Internet history.

So there are a couple of situations where you would run postfix on an
interface other than localhost:

1. You want to ba a relay between your network's computers and the
outside world, or at least your ISP's server. In this case postfix
accepts mail from your users' machines and passes it on.

2. You want to accept mail at your domain name, which is mapped to your
SMTP server's IP address. In this case postfix accepts mail from the
outside world and delivers it locally or makes it available to be
fetched using POP3.

It sounds like you want the latter. You need an IP address that
registered as the MX (mail exchanger) for your domain. Generally it has
to be a fixed address. Also it's good practice to have a backup MX to
accept mail when you are down. 

--

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