26 Jun
2019
26 Jun
'19
8:50 a.m.
On Wed, Jun 26, 2019 at 10:26:31AM +1000, Dave Horsfall wrote:
Are you still here, Warren? I did email you, but no
reply so far (and no
reject either, otherwise I would've spotted *that* too).
All, sorry for the off-topic reply and query. I'm posting this here
so that Dave can read it in the web archive. I'm guessing the problem is
the one Dave identified earlier:
You need to grok Sendmail's log format (and SMTP
in general), but it means
that Minnie connected to my server, waited the requisite time for the greeting
banner, and then shat herself when she saw my ginormous banner and dropped the
connection without so much as a good-bye...
i.e.a multiline response to the HELO/EHLO which meets the RFC specs.
That simple measure, along with the greeting pause and
some simple RFC DNS
checks, block a lot of the crap.
I've just subscribed to the Postfix mailing list, and I'll ask on there
if there is a configuration change I can make to allow my Postfix client
to deal properly with Dave's multiline HELO/EHLO response. And why it can't
at present.
But if someone here already knows, could they let me know?!
Thanks! Warren