Re: Postoffice 3.12 and SMTP routing

Kitt Diebold ( )
Mon, 23 Mar 1998 15:36:19 -0500

Don't use the SMTP Mail Routing Table in Post.Office for this.

I am assuming that your customer has their own domain (or at least
subdomain like If so, first go to your DNS records.
The first priority MX should be their mail server, the second should be
your mail server.

If you are restricting mail relaying (as you should be) you should have
"restrict relay mail except as indication below" with "allow relay from
these IP addresses" checked and your IP address block(s) typed in. Below
that, Allow Delivery to "No Domain exept those listed below" checked and
"Local Mail Domains" and "Additional Domains" checked. The customer's
domain SHOULD NOT BE a local domain. Put their domain name ("")
in the additional domains box.

So far, Post.Office will hold their mail while they aren't on and every xxx
seconds it will retry to send any queued mail and give it to them if there
server is logged on.

Next, check out You will want to
configure their exchange server to connect at a regular interval and send
the QSND command to Post.Office when it connects. The QSND command tells
Post.Office to send their mail to their server right now, instead of
waiting until the next queueing period. That way, their server doesn't have
to wait on-line, and they get their mail as fast as if it were a POP

(To answer another question....) The customer loses a lot of functionality
by co-locating a mail server, rather than having it locally. They lose the
ability to send mail within the office and do any schedule sharing that
exchange might offer.

Hope all this helps....


>We have a customer with an ISDN LAN-LAN connection to
>our internet POP. This means the customers ISDN router dials on
>demand to our portmaster 3 when needed, but our portmaster 3 does
>NOT call their router if their is traffic queued for servers on their side.
>This customer has his own mailserver on his LAN which is not
>permanently connected to the internet because
>he uses ISDN dial-on demand on his side.
>Is there a possibility to set up Postoffice 3.12 under NT
>to collect all the mails for his domain while his server is not
>connected to the internet, and that his mailserver collects
>all these mails from our postoffice server when his ISDN
>connection is up? The customers mailserver is MS Exchange.
>Is the SMTP Mail Routing Table the place to set this up?

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