[exim] Looking for advice on Grey Listing vs outlook.com's b…

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著者: Mark Elkins via Exim-users
日付:  
To: exim-users
題目: [exim] Looking for advice on Grey Listing vs outlook.com's behaviour
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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