> Well, apparently the Spammers have caught on to this type of thing. I have just found that our secondary mail server is getting about 10 times the mail that the actual mail server is. The secondary will accept the mail then send it to the mail server, which bounces it. The secondary will then try to send a bounce message back to the (non-existent, of course) spammer.
Postfix 2.1 includes the "verify" daemon that solves this problem.
Before accepting an email, it can be configured to connect to the destination mail server and probe to see if an email sent to the recipient's address
will be accepted. It caches the responses, so only needs to re-probe for
new addresses (also, the good addresses are likely to be cached, so no problems with legitimate email if the primary is down). It can also be configured to:
Test the sender's address
Reject with a 4xx or 5xx code
I just configured my email relays to use it because one of my domains
has been under sustained dictionary attacks and I wanted to reduce
backscatter.
Simon
------Grrrr.... I have spent more time on mail issues in the last month than any other professional activity.
Patrick
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