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Spamcop blocking Microsoft 365 mail servers?


IIA

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Good morning,

I was emailing back and fourth with an audience member who works at a public college in Canada, when my last reply, which pretty much just said "Thank You" was blocked, and the reason given was that my mail server host Microsoft, is being blocked.

I'm not sure if I'm suppose to share details on this site, and as the recapcha keeps resetting every few seconds, I'll leave my post right there, and hopefully it will help your company to stop blocking email from good people (I'll message him via social media to let his it folks know as well.)

God Bless,

ST

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7 hours ago, IIA said:

"Thank You" was blocked, and the reason given was that my mail server host Microsoft, is being blocked.

Did the message say what IP was being blocked?
Was SpamCop mentioned?
Could show more if IP known
blocking Microsoft 365 mail servers, is usually being done by Microsoft 365 mail servers themselves!
Microsoft 365 is pushing free trials (or has been)
naïve free users start  using "genuine mail lists" which a lot if not all are poisoned email addresses that feed spamtrap blocking servers
SpamCop Blocklists (SCBL) can get activated if enough poisoned email addresses  from a IP
The SCBL is very forgiving and is more of a spam radar which turns on when a flood of poisoned emails hit;
Turns of after 24 hours of no emails hitting the radar
Every serious email receiver use a spamtrap often never again accepting email from a offending IP
mostly they do not let you know and bit bin blocked messages from offending IP's.
Example Gmail may block an email address when,, Your emails IP has been frequently marked as spam. You will not be told by them.

Edited by petzl
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To add to the reply the IP address could be shared with active spammers giving all users the same high spam score for reputation. The blocking can occur whether the spam is sent or received by users. 

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