On Tue, 27 Jul 2021, Al Iverson via mailop wrote:
Microsoft is the mailbox provider most likely to block, that's for sure.
I read these discussions about MS blocking with interest.
Like many others I run a very small volume mail server for
family and friends. Traffic to MS is never more than fifty
emails per week and is usually in single digits. I can quite
literally name almost every single MS recipient of emails from
my server.
Every few months my server gets blocked by MS (and only ever MS)
and I have to do the back-and-forth again with MS support to get
mitigation.
Because my server's volume is so low I have never seen any SNDS
data or JMRP reports. I've never even seen my server's IP
Status as anything other than 'Normal' even days after a block
is imposed. I have met every single condition for delivering to
MS: SPF, DKIM, DMARC, SNDS, provided warmup and traffic figures,
etc. yet I never know when a block is going to happen again.
Late last year I even resorted to changing hosting providers to
one with a better IP reputation in an attempt to avoid bad
neighbours but it's not really helped. To this day I have no
idea why my server has been blocked.
My server is currently blocked by MS yet again and I've just
initiated the usual tiresome process of getting mitigation.
I've reached the point of copy-pasting the emails I send to the
support staff as they go through their standard runbook.
I'm not sure that anyone can offer me anything other than
sympathy but I'm open to any advice or suggestions.
Cheers,
--
ChrisG
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