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Re: [ietf-smtp] SMTP Greylisting Retry Hints + PRDR

2019-02-08 16:14:34
On Fri, 08 Feb 2019 19:45:21 +0000, Ð?илÑ?н Ð?алаÑ?зов said:

What kind of emails have a lot of recipients?  Newsletters and spam.  When 
the spam delivery is postponed, then even
better, as there will be more knowledge about that mail in the DNSBL/DCC 
later.  If the email is a newsletter (MLM),
then its delivery is likely not urgent 

You'd be surprised.  In particular, emergency alert systems that try multiple 
(phone, SMS text, email, sirens, etc) because it's *really* *REALLY* important 
every recipient see it in one form or another, can generate a *lot* of emails 
need to go out *now*.

Google "April 16" for a worked example.

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