Setting up a Gateway

InvictaNet Support support at INVICTANET.CO.UK
Fri Jun 28 10:13:38 IST 2002

My method (so far) is to do this:

Both mailservers have live ip addresses as well as internal addresses.
The external ip address on the scanner/gateway server is in dns as the MX 10
for each domain to be scanned.
The internal ip address on the internal server is in dns as the MX 5 for
each domain to be scanned. on the internal server routes all outgoing email to the external
ip address on the gateway server.

What happens is:
mail arriving goes first to MX 10 on the external address as it can't go
direct to MX 5 on the internal address
mail gets scanned or ignored per mailscanner rules
scanned mail can now be relayed from MX 10 to MX 5 as both servers are on
internal addresses
scanned mail arrives at MX 5 and is dumped in mailboxes
outgoing mail will always leave via the gateway server because of the rule

This all seems to work ok with one major exception.
On the (original) internal server, I queue mail for several dialup customers
who collect by smtp/ETRN. (at present these are not being scanned).
The sendmail rule that I have used as above sends their mail back to the
gateway server, which then loops it back to the internal, which then
These messages never get queued and never get collected.

I'm open to suggestions on how to resolve this...

Martyn Routley
InvictaNet - The Internet in Plain English, Guaranteed
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-----Original Message-----
From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK]On
Behalf Of Dan Cooper
Sent: 28 June 2002 08:46
Subject: Re: Setting up a Gateway

I would be unable to follow Julians advice as layed out in the FAQ as our
main mailserver  has to be available to the outside world.

My plan was to just make the gateway machine a higher MX priority in the DNS
for a particular domain, and then have sendmail place the mail in a mailbox
on the gateway. Then a .forward file could go in the users home dir on the
gateway machine, sending the mail to user at on the main

This, however, did not seem to work, as the messages were not scanned by the
gatweway prior to them being forwarded to the main mailserver.

Any ideas why mailscanner would not scan these messages? all relevant
domains were in the file.


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