[CLUE-Tech] Sendmail question

[Tim Russell]

Well, it's been a coupla years since I set up a config like this, but back
then, I'm pretty sure you didn't have to do anything - the backup hosts
would realize, based on the fact that they're listed as MX records, that
they need to accept it and relay to the primary.

Barring spam-blocking stuff getting in the way, I think it "just works".

Tim

 
> Okay, this one is involved.
> 
> Say I have three mail exchangers in my DNS records:
> 
> mail.mydomain.com		10
> mail2.mydomain.com		20
> mail.someotherdomain.com	30
> 
> Now when an MTA looks up my MX records to send the mail, it 
> will get those
> three addresses. If the first is available it will send it 
> there, if not
> it will try the next entries down the line until it gets one that will
> accept the message.
> 
> How do I have to configure sendmail on the secondary and 
> tertiary hosts to
> relay the mail back to the primary mailhost?
> 
> I know that when you want to relay mail for pop and imap 
> accounts you need
> to add the domain that they are coming from b/c the default config in
> sendmail is set to reject everything that isn't explicitly 
> stated as being
> kosher to avoid spam. You do this by these lines:
> 
> somedomain.com 			RELAY
> evilbastards.com		DENY
> 
> Can someone clarify what it would take to get mail2.mydomain.com and
> mail.someotherdomain.com to relay all the messages to 
> mail.mydomain.com
> without trying to first deliver them to the local mail spool?
> 
> Jeremiah Stanley