Been seeing an awful lot of these lately on one of my email servers
(exim based):
2018-06-11 14:15:44 no host name found for IP address 157.25.104.90
2018-06-11 14:15:47 rejected HELO from [157.25.104.90]: syntactically
invalid argument(s): *.*
2018-06-11 14:21:42 no host name found for IP address 185.221.172.140
2018-06-11 14:21:43 rejected HELO from [185.221.172.140]: syntactically
invalid argument(s): *.*
Anyone know if this is some sort of exploit or just the sign of a
specific type of spambot?
--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org
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