[Exim] Re: Exim as a backup MX

John W Baxter <jwblist@???> writes:
>
>At 1:00 +0100 5/31/2000, Tim Bishop wrote:
>>3. Say Exim was the only backup MX, and the main MX server was down for an
>>extended period of time (say 24 hours). Will Exim queue the mail for that
>>domain normally and thus generate the usual "mail has not been delivered for
>>x hours" messages ? Surely from an end-user point of view when an e-mail is
>>delived to any MX server for a domain it's considered "received" ?
>
>The way we have Exim installed, testing shows that indeed a delivery
>delayed message is sent out if the primary MX is down for the 24 hours
>after the message arrives in the Exim-run secondary MX. There's no
>indication that Exim was serving a secondary role, unless one studies the
>To: address vs the identity of the Mailer-Daemon vs the MX records.

This isn't logically any different from the "primary MX" (more accurately,
any host with the domain in local_domains) sending a warning message if
it has had to defer delivery a message because

. the servers for some domain referenced in a user's .forward file are down
. the user is over quota for his inbox
. etc., etc.

You can play games with delay_warning_condition to try and suppress them,
but I don't really see why you would want to.

Chris Thompson
Email: cet1 [at] cam.ac.uk