Blacklisting (postfix rbl) - recent issue with blackhole.securitysage.com
Yesterday, I received multiple reports from users that they had trouble
mailing us. After checking the maillog I discovered that
blackhole.securitysage.com seemed to block a whole lot of mail to us
(read: all)! I of course immediatly deleted this blacklist from our
reject_rbls but the host blackhole.securitysage.com was just
unreacheable (also see this page
http://wiki.openrbl.org/wiki/Blackhole.securitysage.com). Now it seems
weird that if the rbl host is unreachable Postfix decides to simply take
that as a "ah well, just block everything then", or maybe something else
was going on?
What are you thoughts on this?
Mar 14 11:01:03 hostname postfix/smtpd: NOQUEUE: reject: RCPT
from hostname[ip]: 554 5.7.1 Service unavailable; Client host
[hostname] blocked using blackhole.securitysage.com;
from=<email@example.com> to=<firstname.lastname@example.org> proto=ESMTP
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