We are currently working on adding this functionality to hosted mailboxes.
An error occurred while saving the commentDave E. commented
Since it doesn't seem like Microsoft is going to provide this option I found a way to take care of the problem. Take a look at Microsoft Flow which is part of your Office 365 subscription. Set up a flow that looks like this:
When a new email arrives: Folder: Sent Items, From: Names of relay senders.
Delete email: Message Id: select Message Id from dynamic content list.
Works great here and got me interested in what else I can do with Flow.Dave E. supported this idea ·Dave E. shared this idea ·