Hi Roger,
On Sat, 26 Feb 2011, Jeremy Harris wrote:
On 2011-02-26 09:57, Roger Burton West wrote:
I have two MX machines, call them mx0 and mx1; mx0 is the lower-priority
and does deliveries to users. As is the way of the world, mx1 gets hit
by a lot of spammers with scraped addresses which will be undeliverable
(e.g. message-IDs). At the moment, mx1 accepts the message (assuming it
passes the spam filter), and forwards it to mx0, which rejects it; then
mx1 tries to send a bounce message to the (faked) originator.
Option 1) have both systems lookup the same database (or copies thereof)
in deciding whether an address is valid
Option 2) have the slave system do a recipient-verify callout to the master
system
Option 3) have the secondary only accept mail when the primary is down
(possibly combined with 2):
http://blog.aptivate.org/2009/01/28/backup-mail-exchangers/
Cheers, Chris.
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_____ __ _
\ __/ / ,__(_)_ | Chris Wilson <[email protected]> Cambs UK |
/ (_/ ,\/ _/ /_ \ | Security/C/C++/Java/Ruby/Perl/SQL Developer |
\__/_/_/_//_/___/ | We are GNU : free your mind & your software |
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