And the really annoying block at Microsoft is back / 2022-06-12

2022-06-12 And the really annoying block at Microsoft is back
After receiving another mail in the mail exchange that made me note Microsoft outlook.com wasn't blocking my mailserver anymore we're back right in the same spot:
   ----- Transcript of session follows -----
... while talking to outlook-com.olc.protection.outlook.com.:
>>> MAIL From:<***** .at. idefix.net> SIZE=2035 BODY=7BIT
<<< 550 5.7.1 Unfortunately, messages from [45.83.232.134] 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. [BN8NAM11FT026.eop-nam11.prod.protection.outlook.com]
554 5.0.0 Service unavailable
Aaargh. I thought it wasn't broken anymore. Utterly unreliable stuff at Microsoft.

And I'm back to having to use SMS to explain to very non-technical people why their mail isn't getting through: because they are using outlook.com.

Update 2022-06-13
As a workaround I am now using SMTP2GO to send mail to outlook.com and hotmail.com. SMTP2GO does interesting things (even in a free account) to get the mail delivered and keep their mail 'reputation' in the plus. I hate having to use such a service to get my mail delivered but this is one of those signs that Internet e-mail has been demolished by spammers.

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