An Early Gift, EOP Bulk Mail Detection – The Easy Way

This past summer we added new bulk detection capabilities to Exchange Online Protection. At the time, if you wanted to take advantage of these new capabilities you had to add an EOP transport rule to detect the BCL (bulk complain level) that EOP stamped on incoming messages. This new capability worked wonderfully, but the problem…

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Is X-Microsoft-Antispam a New EOP Header

Yes, yes it is, and I’m glad you noticed! X-Microsoft-Antispam is quite new and only started showing up in messages passing through EOP a few months ago. This new header currently contains two published values to help with bulk mail and phishing detection. BCL – Bulk Complaint Level PCL – Phishing Confidence Level The beauty…

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