On 18 Nov 2019, at 6:59, @lbutlr wrote:
Is it safe (or mostly safe) to simply block attempts to deliver mail
with a helo that is only an IP address? (I am talking about only on
postfix/stmpd and obviously not on postfix/submit or related).
Yes.
There are cases of Special Needs Nodes (printers, antique Cisco gear,
random IoT devices) which may not be able to do port 587 or 465 and
can't contain the concept of their very own real hostname. Generally
these are rare enough these days that it is feasible to handle them as
exceptions.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
