>> Hello courier users.
I have a problem with courier server - especially SMTP module.
I send a mail through transparent mail proxy on our firewall. When the
primary MX of recipient's domain in unreachable, i get this reply from
relay:
421 4.4.1 Unable to contact destination
There is no such error message in Courier.
Of course, this message comes from our damned firewall/mail proxy, when
remote MTA is unreachable.
Other MX records aren't tried and the mail is deferred. I'd like
courier to contact backup MX'es before deferring the mail.
How can I achieve this?
You can achieve what you want by learning a little bit about SMTP
first. If the above message is received in response to a delivery
attempt, the message is interpreted as an indication of a temporary
failure, and to try again later. That is “later”, and not “try another
mail relay now”. Do to otherwise would be a behavior more akin of a
spam generator, and is likely to get you blacklisted as such
OK, do I have any chance to change Courier's response to this errorcode
(421) from 'try again later' to 'try another relay'?
I really don't want to switch to another mailserver - I'm used to
Courier and i think it has better concept than any other MTA. But this
feature/bug is quite critical for me.
One more question: In what circumstances Courier falls back to backup
(secondary) MX?
Thank you for help,
Martin Horak
-------------------------------------------------------
This SF.Net email is sponsored by: Oracle 10g
Get certified on the hottest thing ever to hit the market... Oracle 10g.
Take an Oracle 10g class now, and we'll give you the exam FREE.
http://ads.osdn.com/?ad_id149&alloc_id?66&op=click
_______________________________________________
courier-users mailing list
[EMAIL PROTECTED]
Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
