How we use the Certified Senders Alliance IP reputation list

If you are a subscriber to the good folks at Eco over in Germany, you might have noticed in their regular newsletter that Outlook.com and Office 365 is now a new ISP partner. What does that mean? Over here at Outlook.com and Office 365, we have a complicated relationships with good IP reputation lists. Outlook.com…

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Should you warn users when they receive an external message?

I’ve been asked a few times what I think about organizations that add warnings to messages that their users receive when the message is sent to them from outside the organization. That is, some organizations create Exchange Transport Rules (ETRs) when the message is received outside the organization. This might look something like this: This…

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