On 16-04-19 07:01 AM, Michelle Sullivan wrote:
Any other problems like HELO/EHLO not being FQDN, not matching the host,
not existing etc... I'll usually 4xx or ignore (e.g. ignore for not
matching, 421 for not existing... etc.)
Regards,
Hey, stop telling them all our tricks :)
Yes, we also reject outright any HELO that is just a dotted quad in most
of our technologies.. And usually mark as Spam anything that doesn't
present a FQDN in the HELO, or generic localhost.localdomain.
We found that you cannot make a policy that the HELO matches PTR, still
too many HELO's represent internal naming conventions for the server,
and do not match the outgoing IP, but it is used as an indicator for
many of our filtering patterns in conjunction with other indicators.
HELO is easy to forge, the PTR is not, so it is helpful but not
absolute. All we ask is that the email administrator at least took the
time to set up a FQDN for the server host name (which is usually what is
used for the HELO in most email server implementations by default)
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