EMail server gets blocked by Microsoft

Brian Turnbow b.turnbow at
Tue Apr 27 14:46:56 UTC 2021

Hi Dominque,

And sign up for snds

It will give you the status of your IPs and  you can get jenkmail reports etc.


From: NANOG < at> On Behalf Of Mel Beckman
Sent: Tuesday, April 27, 2021 4:19 PM
To: Dominque Roux <dominique.roux at>
Cc: nanog at
Subject: Re: EMail server gets blocked by Microsoft


Have you read this Microsoft guidance on email servers? It covers the most common problems, such as missing SPF records, incorrect or missing IN-ADDR DNS, etc:

 -mel beckman

On Apr 27, 2021, at 6:54 AM, Dominque Roux <dominique.roux at<mailto:dominique.roux at>> wrote:
Hi All,

is there anyone out there who has some experience with the blocking
mechanism of Microsofts mail server? We're running a mail server at our
company which ends up on their blacklist from time to time and we're
wondering if there are some steps we could take in order to prevent this.

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