RE: Microsoft contact

["Tony Wicks" <tony () wicks co nz>]

Not unusual for random O365 blocks to appear, I especially like they way the reject message trys to refer the user back 
to their ISP as if their ISP is in any way involved with the internal Microsoft blocklist. “<<< 550 5.7.1 
Unfortunately, messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their 
network is on our block list (S3150).”

 

 

If you log it here “https://olcsupport.office.com/“ , in a day or two they normally fix it, always after saying "I do 
not see anything offhand with the IP’s (x.x.x.x) that would be preventing your mail from reaching our customers", then 
you reply to them with “well there is a problem as you are bouncing the email as per the bounce message”. Then they fix 
it. Same routine every time.

 

 

 

From: NANOG <nanog-bounces+tony=wicks.co.nz () nanog org> On Behalf Of David Bass
Sent: Thursday, January 11, 2024 7:32 AM
To: <nanog () nanog org> <nanog () nanog org>
Subject: Microsoft contact

 

Hi everyone, hope y’all had a great holidays. 

 

I’m looking for a Microsoft Office 365 contact who can help us…we’re struggling to get anywhere using the standard 
methods.  

 

We have a customer whose subnet is blacklisted, and is causing a lot of heartache.  We’ve proven to a couple of people 
at this point that Microsoft is blocking inbound traffic from this subnet, and so they can’t send/receive emails or 
access M365.  This is a new eyeball network, so needless to say that it’s painful. 

 

Appreciate the help!

 

David