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Topics - Darkanoid

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Hello everyone.
I found problems reaching Microsoft 365 mail servers.
The following error occures:
Code: [Select]
Nov 20 12:57:12 4 postfix/smtp[1592]: EED7AC1A5C: to=<p***@****.com>, relay=***-com.mail.protection.outlook.com[213.199.180.170]:25, delay=96174, delays=96158/0/15/0.26, dsn=4.4.4, status=deferred (host *****-com.mail.protection.outlook.com[213.199.180.170] said: 451 4.4.4 Temporary server error. Please try again later ATTR5 (in reply to MAIL FROM command))
I can send mail to Gmail/Hotmail/Outlook.com/Live and receive it.

Also the problem occures on other Centospanel servers.

Could it be that I need a real SSL certificate and not self signed?
When I test it on testconnectivity.microsoft.com there are no problems. Everything is in the green! (No ban)
All rbl's in the green.

Maybe the *.mail.protection.outlook.com having problems with selfsigned certificates?

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