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From: Oguz Yilmaz (oguzyilmazlistgmail.com)
Date: Sat Apr 10 2010 - 15:55:54 CDT
I am testing sender address verification on our servers. When I first
enable reject_unverified_sender before RBL testing, in 1 day, my IP
addresses was in CBL blacklist after 1 year of clerance.
Then I have tuned the configuration and put sender address
verification after most of the UCE measures. The latest configuration
is as below. However, then in 5-6 days the domain was in blacklist
What can you suggest not to blacklisting again?
Should I add some other measures before reject_unverified_sender? What can be?
Should I disable SAV for some domains to prevent blacklisting? Which domains?
Postfix is 2.2.11
unverified_sender_reject_code = 450
smtpd_delay_reject = yes
disable_vrfy_command = yes
data_directory = /var/spool/postfix
address_verify_map = btree:$data_directory/verify_cache
address_verify_sender = double-bounce
address_verify_negative_cache = yes
address_verify_negative_expire_time = 1d
address_verify_negative_refresh_time = 3h
address_verify_positive_expire_time = 31d
address_verify_positive_refresh_time = 7d