Hi Fernando,
Did you make any headway this issue? We've been having the same issues since
April 6.
Regards,
Mark
On 2023-04-13 15:25, Fernando MM via mailop wrote:
Hi,
On Apr 06 we detected that 28 IPs were blocked in Outlook.com, all with the
following error:
550 5.7.1 Unfortunately, messages from [185.103.9.41] weren't sent. Please
contact your Internet service provider since part of their network is on our block
list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors
<http://mail.live.com/mail/troubleshooting.aspx#errors>.
Although some of the blocked IPs were new, most of them were in use by the same
customers for years without issues. Part of them didn't had a single spam
report or spam trap hit in the last 3-6 months.
After making sure that these servers weren't compromised, I opened tickets at
https://olcsupport.office.com/ <https://olcsupport.office.com/> and, after escalation,
the response was that the IPs didn't qualify for mitigation at this time or that there were
"changes in email sending volume" ( there weren't, the volume hasn't changed since we
have limits for each IP/customer to avoid these issues )
Today I noticed that the data on Apr 06 in missing in SNDS. All other dates are
showing up, just Apr 06 is missing.
I was wondering if anyone else experienced similar issues on Apr 06 with
missing data on SNDS or a high number of IPs getting blocked?
Thanks.
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