On 2020-08-05 11:09 p.m., John Levine via mailop wrote:
In article <[email protected]> you write:
I'm part of the group that runs the postgresql.org mailing lists and
we've been having some challenges getting email delivered to cox.net due
to their... rather aggressive max-connections blocking. Their unblock
request support was less than helpful.
Anyone on here who could perhaps help out, or at least commiserate?
I've had similar problems with Comcast, and dealt with it by twiddling
the MTA behind the mailing list to rate limit the number of
connections per destination. In my experience it doesn't slow the mail
down much and makes those problems go away.
Not with Cox. I set MAXHOST=1, which seems to effectively limit
outgoing sessions per MX.[*] However, whenever I happen to send them
mail I keep getting those 421 replies and bogus "too many sessions".
Sometimes it takes several hours to send a few dozens messages.
Best
Ale
--
[*] Rough discussion last March:
https://sourceforge.net/p/courier/mailman/message/36946100/
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