Mailing List Message #12965
From: Michael Croft <>
Subject: Re: Which ports should I leave open?
Date: Fri, 9 May 2003 09:16:26 -0500
To: SIMS Discussions <>
At 9:13 AM -0500 5/9/03, Michael Croft wrote:
>At 6:57 AM -0700 5/9/03, Gezer Studio wrote:
>>Hello everyone,
>>I'm currently setting up a mail server and decided to use SIMS.
>>I really need it only to receive messages, I can do the sending via my
>>ISP's SMTP server.
>>For now I have two ports open on my router, port 80 and 110 (i also
>>have a web server).
>>Do I need to open port 25 as well?
>>Do I need ports 110 and 25 open in order to receive mail or one of them
>>is enough, which one?
>>I'm kind of baffled here.
>Let me take a stab at this, because I also need to know if I'm horribly
>wrong.  By "open" I mean that the firewall/router should allow traffic to
>and from these ports.
>Receiving Mail 110 needs to be open for a client outside the firewall to
>receive mail.  If you're only checking from inside, you don't need this.

sorry for the self-reply, but let me clarify that.  110 is for checking
mail.  It is the POP3 port for Mail User Agents to talk to Mail Transfer
Agents.  It is a client protocol and by "receive" I meant "check"

>Sending Mail 25 needs to be open to receive or send mail.
>Web Server 80 needs to be open for http traffic
>Change Password port 26 needs to be open to allow users to change passwords
>(if necessary), not a common mail client feature, but available in, for
>example, Eudora.
>Web Admin Port 8080 (by default.  Something else if you change the default)
>needs to be open to allow web admin
>Communigator Port(s) ???
>There are others if you are using additional services, but these are the
>ones that affect SIMS directly.
>You may want to configure SIMS to use your ISP SMTP server as well, because
>some messages (like automatically generated ones) will go through it.
Michael Croft
SAM: It's 106 miles to the Crack of Doom. We've got a magic ring,
           two daggers, it's dark, and we're wearing sunglasses
FRODO: Hit it.
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