Hello,
we had similar issues, sometimes with IP addresses that have NOT been
sending emails for months.
Approx. one month ago we registered all the IP addresses with SNDS
(Smart Network Data Service) *and* JMRP (Junk Mail Reporting Program).
Paying great attention to each complaint. The blocks continued but
slowed down. See https://postmaster.live.com/snds
When re-asking for "delisting/mitigation" in the email reply to "Nothing
was detected to prevent your mail from reaching Outlook.com customers",
we always include the error message received for each IP address and the
notice that under the SNDS control panel the "View IP Status" option
shows: "All of the specified IPs have normal status".
Regards
Andrea
On 19/02/2024 15:15, Fernando MM via mailop wrote:
Hi,
Over the past two weeks, I started to notice an increase in the number
of S3150 rejections. Example:
550 5.7.1 Unfortunately, messages from [xxx.xxx.xxx.xxx] 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>.
The main issue is that when I contact them at
https://olcsupport.office.com/ <https://olcsupport.office.com/>, I
receive a reply indicating that "Nothing was detected to prevent your
mail from reaching Outlook.com customers.".
I have to reply and wait for them to escalate. After some time, I
finally get "We have implemented mitigation for your IP
(xxx.xxx.xxx.xxx) and this process may take 24 - 48 hours to replicate
completely throughout our system.".
Asking for more details about the issue doesn't help as they refuse to
provide any. And the main issue is that the IPs will usually get blocked
again after a few days.
These IPs never had issues before and, after doing a full review,
nothing was found on our end. No changes in the content patterns (
mainly invoices and order confirmations ), nothing that indicates that
the server was compromised etc.
I was wondering if anyone else is also experiencing this type of issue?
Thanks.
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