EOP Field Notes

Exchange Online Protection: Notes from the field

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  • Blog Post: 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...
  • Blog Post: Easily tell which transport rules a message triggered

    Hello fellow traveller, come sit with me by the fire, there is plenty of room. You look to be weak from your travels, I have plenty of rations that I will gladly share with you. I have many stories from my own travels that I would love to share. Wait…, you want to know about tracking which rules...
  • Blog Post: P2 Headers Now Respected for End User Safe and Blocked Senders Lists

    Exchange Online Protection will now evaluate both the P1 and P2 headers in a message against an end users safe and blocked senders list. I know, I’m super excited too! Previously only the P1 header of a message was compared to these lists. Not only does this make blocking or safe listing within...
  • Blog Post: 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...