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Postfix HOWTO for Debian Woody

Installation

All I did was entering dselect, selected "postfix" to be installed and accepted the dependencies. dselect's [I]nstall installs everything.
(You could also run "apt-get install postfix", of course ...)

During the installation you're asked whether your site is an "Internet site", "Internet site using smarthost", etc. I chose "Internet site" (as my system shall send and receive mails using one dedicated host-name "yellow.subnet.at").
The other questions during the installation are:

Mail name: yellow.subnet.at
"[...] should it append .$mydomain? [...]": No.
"comma-separated list of domains that this machine should consider itself the final destination for": yellow.subnet.at, localhost
"Where should mail for root go": admin <@> mydomain.net

With this Debian default installation, Postfix works perfectly locally. The following is possible:

Using mutt, send mails from "yellow" to miscellaneous mailing-addresses.
From a different machine using a different SMTP-server, send mails to "user-at-yellow.subnet.at" for local delivery.
From a different machine using yellow.subnet.at as the SMTP-server, send mails to "user-at-yellow.subnet.at" for local delivery.

Using this Postfix installation to send mails from a different machine to miscellaneous mailing-addresses (not "yellow-local") is not possible due to "Relay denied". (See e.g. the config file's "relay_domains" option on this one. My sample main.cf can be found below.)

Some "Tuning"

It's always a good idea to deactivate the VRFY command (which is often used by spammers to easily find out about in/valid mailboxes):

Add to /etc/postfix/main.cf:
  disable_vrfy_command = yes

Postfix and Mailman

I finally got this combination work correctly... Please see my Mailman Howto.

Here's my main.cf including the corresponding Mailman configuration.

Postfix Resources

Review of "The Book of Postfix". (The book itself can be found at e.g. Amazon.)

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