RE: SBS2003 e-mail server
From: Jeff Meager (JeffMeager_at_discussions.microsoft.com)
Date: 01/24/05
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Date: Mon, 24 Jan 2005 15:59:02 -0800
Hi Rene. I am experienced in such setups. What is happening is this. The
ISP is blocking inbound port 25 to you but only from an EXTERNAL SOURCE. Ie,
at their border router they block all port 25 to users. They however allow
port 25 to their own mailserver obviously.
By putting thier mailserver ad the secondary MX, when an email cannot
directly connect to your server (as they have blocked it), it will go to the
secondary server (which is theirs). Thier server however CAN contact you via
port 25 as it is within the border router where the port 25 block is. Their
email server contacts yours (as it is listed as the primary mx), and relays
the email to you.
It will work without any problems, it's just not perfect. You will always
rely on their mailserver to be functional, and you will suffer their
mailservers load, ie time for email to arrive.
You need to contact whoever provides the DNS for your site and tell them to
put your ISP's mailserver as the secondary MX. This is easy. Ask your ISP
for these details if need be. ALSO! Make sure your ISP sets up Relaying on
their server for your domain, or their mailserver will reject your mail.
Once you have done this, it will just work!
Jeff
"Rene" wrote:
> I have SBS2003 and want to run my own mailserver.
> I have a domain and a ISP DNS service pointing to the IP address. HTTP
> access to server OK.
> But my ADSL ISP (not the same as the DNS provider)have for security reasons
> closed routing of tcp/25, they tell me that I have to setup DNS with a
> secondary mailserver (backup-mx.post.tele.dk) . With the following:
>
> mail.domaene.dk. IN A x.x.x.x
> domaene.dk. IN MX 10 mail.domaene.dk.
> domaene.dk. IN MX 20 backup-mx.post.tele.dk.
> How can this be done
> Outgoing mail is OK via relay host smtp.mail.dk
- Next message: Marina Roos [SBS-MVP]: "Re: IMF and Backups"
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- In reply to: Rene: "SBS2003 e-mail server"
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