Hi All,
I run a personal MTA but I host a few not-for-profits and such.
Recently one of my users reported substantial delays on inbound emails,
so I had a quick look... it turns out email from outlook.com was being
seriously hindered by Greylisting.
The retry rate on a 4xx error seems to be very slow (almost precisely an
hour between retry attempts) and of course, the source IP address
changes with each retry, so the Greylisting timers are always reset to
zero... clearly I don't do enough mail volume to keep the timers up to a
point where I know i'm getting 'clean' email.
The only way I can see to reliably resolve this is to try to whitelist
the sending IP's (is this even practical?) It'd be nice of messages
from outlook.com were retried from the same source IP... this behavior
seems to make greylisting on relatively low-volume mail servers
something of a hassle, and across many years of running the MTA
configured essentially this way, this is the first time i've had this
sort of behavior reported.
Cheers,
Mark.
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