Hi Dominque, And sign up for snds https://sendersupport.olc.protection.outlook.com/snds/index.aspx It will give you the status of your IPs and you can get jenkmail reports etc. Brian From: NANOG <nanog-bounces+b.turnbow=twt.it@nanog.org> On Behalf Of Mel Beckman Sent: Tuesday, April 27, 2021 4:19 PM To: Dominque Roux <dominique.roux@ungleich.ch> Cc: nanog@nanog.org Subject: Re: EMail server gets blocked by Microsoft Dominque, 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: https://sendersupport.olc.protection.outlook.com/pm/troubleshooting.aspx -mel beckman On Apr 27, 2021, at 6:54 AM, Dominque Roux <dominique.roux@ungleich.ch<mailto:dominique.roux@ungleich.ch>> 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. Cheers, Dominique

On Wed, 2021-04-28 at 09:30 +0200, Markus wrote:

Am 27.04.2021 um 16:46 schrieb Brian Turnbow via NANOG:

...

Hi Dominque,

And sign up for snds

https://sendersupport.olc.protection.outlook.com/snds/index.aspx <https://sendersupport.olc.protection.outlook.com/snds/index.aspx>

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

That shit doesn't even work. Just tried. First, you HAVE TO create a Microsoft account to access it. Then, solve some riddles. Enter the IP range you're responsible for. Receive an E-Mail containing a confirmation link which you must click on, and if you do, you get: "Unknown authorization request ID". (Yeah, c&p doesn't work either) And that's it. And you just wasted 5 minutes of your life. So typical.

ProTip: Click "Access Control" on the left hand side of the page after you get the "Unknown authorization request ID" error. :) -Jim P.

I just unlocked ddostest.me with this tool for outlook.com, Hotmail.com, msn.com and maybe all the O365 suite. It was fix in less than 24 hours. Thanks for the tip Jean From: NANOG <nanog-bounces+jean=ddostest.me@nanog.org> On Behalf Of Mike Hammett Sent: April 28, 2021 7:52 AM To: Michael Fallen <mikefallensignup@gmail.com> Cc: nanog@nanog.org Subject: Re: EMail server gets blocked by Microsoft Neither Microsoft nor Google have been successful at making tools that work for low-volume mailers. They seem to think that if you're not in their club, you're either a commercial email marketing firm or SPAM. ----- Mike Hammett <http://www.ics-il.com/> Intelligent Computing Solutions <https://www.facebook.com/ICSIL> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> <https://www.linkedin.com/company/intelligent-computing-solutions> <https://twitter.com/ICSIL> <http://www.midwest-ix.com/> Midwest Internet Exchange <https://www.facebook.com/mdwestix> <https://www.linkedin.com/company/midwest-internet-exchange> <https://twitter.com/mdwestix> <http://www.thebrotherswisp.com/> The Brothers WISP <https://www.facebook.com/thebrotherswisp> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> _____ From: "Michael Fallen" <mikefallensignup@gmail.com> To: "Dominque Roux" <dominique.roux@ungleich.ch> Cc: nanog@nanog.org Sent: Tuesday, April 27, 2021 9:22:29 AM Subject: Re: EMail server gets blocked by Microsoft Microsoft seems to be one of the worst offenders in terms of having a email blocking blackbox. Good luck getting in contact with someone as well. Throughout the years of self-hosting email they have always been the most problematic of the large providers. -- Mike Dominque Roux wrote on 2021-04-27 3:35 AM:

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.

Cheers, Dominique