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Re: [Savannah-hackers-public] Suspicious ‘451-You dont seem to have a r

From: Bob Proulx
Subject: Re: [Savannah-hackers-public] Suspicious ‘451-You dont seem to have a reverse dns entry.’
Date: Sat, 20 Nov 2021 15:58:30 -0700

Tobias Geerinckx-Rice wrote:
> First of all, thanks for the lengthy response.  I could only skim it. 

I do sometimes get that response.  :-)

> Bob Proulx 写道:
> > Since it is reported as being greylisted this should have been a
> > single one time delay for the greylist and then all subsequent
> > interactions would remember your address and avoid the delay.
> This server has delivered a ludicrous number of messages to debbugs over the
> years :-) including several only yesterday (19 Nov).  Of course, the TTL
> might be something like 24h, without being itself unreasonable.

But you only showed exactly one of the messages.  You might follow-up
to sysadmin with three or five from different days to show that the
greylisting is not working.

And that greylisting is on top of the issue not resolved about FCrDNS
which would have avoided the greylist delay.

In my mind the above ordering of fixes is most desirable because it
fixes the most things.  First the greylisting which should work.  Then
the FCrDNS which should avoid it.

Just as a by-the-by comment too is that likely a workaround would be
to force IPv4 for this transport.  At a guess.  But better to get
those two problems above fixed.

Good luck!

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