Mail Protection: SMTP, POP3, Antispam and Antivirus Spam (confirmed) with Microsoft 365 senders

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Spam (confirmed) with Microsoft 365 senders

Steve Weißflog over 3 years ago

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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Top Replies

LuCar Toni over 3 years ago in reply to DouglasFoster +3

Interesting enough that Central Email does this already with the power of SophosLabs. So we are doing this and much more in the Central based approach. Because there is one additional part of Check,…

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0 JT~ over 3 years ago

At 9:45am (GMT) all our outbound email was quarantined as spam confirmed. reason="as" extra="confirmed"
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0 JT~ over 3 years ago

At 9:45am (GMT) all our outbound email was quarantined as spam confirmed. reason="as" extra="confirmed"
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0 DuncanNewell over 3 years ago in reply to JT~

We are see higher tha normal levels of emails been detected as SPAM, mail that is usually allowed is now bee blocked as spam.

Thanks, Duncan
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