1
prod.outlook.com
Problem reported by Sabatino - 10/11/2023 at 9:45 AM
Resolved
One of my users had my email server added to the outlook.com blacklist

[2023.10.11] 18:36:15.215 [24641966] RSP: 451 4.7.500 Server busy. Please try again later from [xx.xx.xx.197]. (S77719) [AM2PEPF0001C711.eurprd05.prod.outlook.com 2023-10-11T16:36:15.157Z 08DBC96CFF1F3A10]

Now I moved the outbound to another IP.

But on that IP I have a high reputation (sendscore 98 - cisco talos reputation ip good - ip reputation check by cyren: no risk). Furthermore, the IP is not on any blacklist.

Do you know how long we will have left? I can't find a way to request removal. do you know anyone?

I still find what happened crazy.
One of my users sent a message to a domain protected by prod.outlook.com with 10 recipients from the same domain. By default, this domain does not accept messages with multiple recipients. Not being able to communicate, my client thought it best to resend the message several times (3 times). Then he asked a colleague of his to do the same (always 3 times)

But does it seem normal to you that pro.outlook.com has blacklisted the server?
Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy

4 Replies

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2
Zach Sylvester Replied
Employee Post
Hey Sabatino, 

I took a look at Microsoft's Health dashboard for Office 365 admins and it reported that they are currently having some issues. https://portal.office.com/Adminportal/Home#/servicehealth/:/alerts/EX680695. Please note that you need to have a Microsoft 365 administrator account to view this info. 


So this isn't a SmarterMail issue but a Microsoft one. 

Thanks, 

Zach Sylvester

System/Network Administrator
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Reto Replied
Thanks Zach for the Info. We have the same problem.
2
Kyle Kerst Replied
Employee Post
For future reference though - this form should get your IP/case reviewed pretty quickly:

Kyle Kerst
System/Network Administrator
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
1
Sabatino Replied
Thank you all.
The problem seems to be solved. The IP has been unblocked. Maybe they solved the problem

Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy

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