Hi Exim Users,
I'm looking for advice on Grey Listing vs outlook.com's behaviour of
retrying to send from multiple SMTP relays.
Many years ago, we added Grey Listing as a feature to Exim. This delays
the receiving of new emails by 10 minutes, so the next try will usually
work but allow for that combination to be properly black-listed - if
required. This is done by saving the tuple of information, From, To,
SMTP_Relay. I usually save it for 12 months.
This usually works well - initial emails are delayed by 15 minutes - no
one complains.
However, emails via Microsoft will keep changing the identity of the
SMTP_Relay to a group of 10 or so SMTP Servers, so the initial delay
keeps getting implemented ==> Customers complain.
I could:-
1 - Remove grey Listing - but it used to have a purpose and I assume
still has?
2 - Remove the SMTP-Server element from Grey Listing - but it was put
there for a reason?
3 - White list all the Outlook.com SMTP Server addresses - do they
though remain static?
What do people advise?
If No. 3, anyone have a definitive list to WhiteList with? Perhaps a
link to a dynamic WhiteList?
--
Mark James ELKINS - Posix Systems - (South) Africa
mje@??? Tel: +27.826010496 <tel:+27826010496>
For fast, reliable, low cost Internet in ZA:
https://ftth.posix.co.za
<
https://ftth.posix.co.za>
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