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Customers are reporting issues with email delivery because the IP address of the Microsoft 365 mail server is listed on Spamcop.
IP's:
40.107.22.51
https://www.spamcop.net/bl.shtml?40.107.22.51
40.107.21.76
https://www.spamcop.net/bl.shtml?40.107.21.76
Thank you for your attention!
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
We have problems sending emails due to blacklisting.
40.107.247.119
Reputation Lookup || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence
Thank you for your support
Same issue
Client host [40.107.21.80] blocked using bl.spamcop.net;
Please add this one to the list.
Decision Engine classified the mail item was rejected because of IP Block (from outbound normal IP pools) -> 554 5.7.1 Service unavailable; Client host [40.107.243.69] blocked using bl.spamcop.net; Blocked - see https://www.spamcop.net/bl.shtml?40.107.243.69
We have problems sending emails due to blacklisting.
40.107.21.43 https://www.spamcop.net/w3m?action=checkblock&ip=40.107.21.43 Thank you for your support.
We have problems sending emails due to blacklisting.
40.107.7.58
Thank you for your support