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Spam (confirmed) with Microsoft 365 senders

Steve Weißflog

It seems an old problems reoccurs - we see "false positive" spam confirmed blocked E-Mails from MS 365 senders at our customers...

We see "spam confirmed" for some MS 365 Mailserver IPs:

40.107.4.116 or 40.107.22.101 or 40.107.3.125

If I check that with cyren - it is green / no risk - also when I check different blacklists for this IPs

Maybe corrupt pattern?

Seems this problem is back:

https://community.sophos.com/utm-firewall/f/mail-protection-smtp-pop3-antispam-and-antivirus/100082/spam-confirmed---problems-with-cyren-database-or-bad-pattern

Anybody else can confirm this?



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