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I'm testing out this new feature in exim on tclug-list; called sender 
verification. It's part of the new ACL stuff in exim.

More details here:

http://www.exim.org/exim-html-4.20/doc/html/spec_37.html

NOTE, I have the defer_ok option on, so if the callout to verify the sender 
fails with in 10s, the acl will pass and the message will be accepted, so NO 
message will be dropped.

After I'm more confortable with this feature, I might remove the defer_ok 
stuff.


More or less this tries to verify the sender's address.

$ telnet mailman.real-time.com 25
Trying 208.20.202.13...
Connected to pirate.
Escape character is '^]'.
220 pirate.real-time.com ESMTP Thu, 22 May 2003 00:20:59 -0500
helo real-time.com
250 pirate.real-time.com Hello gladiator.real-time.com [208.20.202.31]
mail from: blahhahh at real-time.com
250 OK
rcpt to: root at real-time.com
550-Verification failed for <blahhahh at real-time.com>
550-Called:   208.20.202.3
550-Sent:     RCPT TO:<blahhahh at real-time.com>
550-Response: 550 5.1.1 <blahhahh at real-time.com>... User unknown
550 Sender verify failed

Please let me know if there are any problem. Thanks.

- -- 
Bob Tanner <tanner at real-time.com>         | Phone : (952)943-8700
http://www.mn-linux.org, Minnesota, Linux | Fax   : (952)943-8500
Key fingerprint = AB15 0BDF BCDE 4369 5B42  1973 7CF1 A709 2CC1 B288
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