[olug] Senmail relaying

[Ryan O'Rourke]

Well, maybe I should explain myself more clearly. Looking back on my
original message I see it's somewhat vague.
I administer a Sendmail-8.12.8 box running RH9. Someone else administers
an Exchange server (our main office email server), and a Lotus Domino
server (mail for a different, internal, non-routeable domain).

For most users their mail is handled like this:
Mail to *@maindomain.com is handled by Exchange.
Mail to *@otherdomain.com is relayed from Exchange to Domino and is
delivered.

However, Linux desktop users prefer to use sendmail for SMTP and
therefore haven't been able to send mail to otherdomain.com

I need to get Sendmail set up so it will just dump email addressed to
otherdomain.com directly to Domino.

I tried what you suggested below by adding an MX record for
otherdomain.com to /var/named/db.maindomain.com. The MX records now look
like so:
	MX 10 exchange.maindomain.com.
	otherdomain.com MX 10 domino.maindomain.com.

I also created the file /etc/mail/relay-domains:
	.otherdomain.com         RELAY

Finally I restarted Sendmail and tested. The delivery of a message from
mydesktop.maindomain.com to someone at otherdomain.com failed.

hrmmm... I'm sure someone's got something completely fubar here so any
suggestions would help!
Thanks again.

-- Ryan

On Fri, 2004-04-02 at 13:59, Trent Melcher wrote:
> What you can do is, first I assume you have an MX record out there that
> points somedomain.com to your current mailserver.  You should have an
> internal name server that you mailserver does his lookups on and  this one
> will have an MX record for somedomain.com that actually points to the
> mailserver you want to relay it too.  You will also need to add
> somedomain.com to the /etc/mail/relay-domains file of the relaying
> mailserver.
> 
> If you need more detail, or if I havent explained it clear enough let me
> know.  I use this setup, I have 10 domains inside my firewall,  I have a
> central mailserver that all email for all 10 domains go to first to get
> scanned for SPAM/viruses,  then this mailserver relays the mail based on the
> domain to the correct mailserver.
> 
> Trent
> 
> -----Original Message-----
> From: olug-bounces at olug.org [mailto:olug-bounces at olug.org]On Behalf Of
> Ryan O'Rourke
> Sent: Friday, April 02, 2004 11:44 AM
> To: olug at olug.org
> Subject: [olug] Senmail relaying
> 
> 
> I'm very new to Sendmail and am trying to configure it so any email sent
> to it with a *@somedomain.com address will automatically be forwarded
> onto a different server for processing.
> Can anyone help to point me in the right direction?