Heyhey.. Lately I've been noticing spammers (I guess) spoofing IP addresses, by incrementing the final octal of the IP, as shown here
.. They send about once a minute, so greylisting doesn't work. Delivery logs show most of their messages contain viruses, so I'm looking to stop them before one slips thru.
Is there any way to prevent this? Is it good practice to blacklist the IPs, or is it possible I'll be blacklisting valid servers? Thoughts?
(SmarterMail Enterprise 15.5.6222)
(sidenote: adding images into these posts is really difficult).