Today my mail server suddenly begun rejecting to send mail. In SMTP activity log there seems everything OK, but in debug log I find most of e-mails to be rejected due to blacklisting of RECIPIENT or SENDER.
It is NOT my server's I in blacklist!
Code: Select all
Recipient Denied: (xxx.xxx.xxx.xxx) was found in DNS blacklisted database VOX DNSBL.
1.) I do NOt have VOX DNSBL in my SMTP filters! I only have 1 DNS blacklist enabled: sbl-xbl.spamhaus.org
2.) When I query VOX DNSBL, I get TimeOut!
So, obviously ME PRO does not differ valid answer from timeout, and thinks timeout is positive answer.
How to solve this, except of disabling the blacklist?