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List:       freebsd-hackers
Subject:    Is this a cache poisoning attack?
From:       George Mitchell <george+freebsd () m5p ! com>
Date:       2017-04-17 18:19:24
Message-ID: 15f762bd-383b-3545-c300-2b0bc92f2cfd () m5p ! com
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I'm getting a plethora of errors like this in my system log, as my
sendmail is attempting to validate the domain names of incoming
envelope senders of spammers (identifying info deleted):

DNS format error from xxx#53 resolving xxx/MX for client xxx:xxx: Name .
(SOA) not subdomain of zone xxx -- invalid response

FreeBSD 10.3-RELEASE-p18, BIND 9.11.0-P5.  Name service seems to be
working normally otherwise.  Is this a symptom of an attempted cache
poisoning attack?                                          -- George


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