From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Johannes Walch" <j.walch@nwe.de>
Subject: Re: What ports need to be open to allow for mail?
Date: Thu, 10 Apr 2003 12:42:43 +0200
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> Hello All,
>
> I'm trying to set up my mail server; however I want to
> make sure that I have the correct port(s) open. I
> already have TCP port 25 open; however do I also have
> to have UDP port 25 open as well? Any help would be
> appreciated.
>
> Thanks,
> James

If you want to run SMTP (the standard case) with your mail server port
25/TCP ist sufficient. Port 25/UDP is not used by sendmail or any other SMTP
server software (as far as I know).

johannes walch