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How to block incoming mail with blank sender

Hi community,

in the last days we get more and more spam, where the Sophos UTM shows in mail manager, that there is MAIL FROM address set.

When the message is delivered to our Exchange server, the mail shows up in the inbox of the user with an internal sender from our own domain.

Is it possible to block emails with a blank MAIL FROM? Or are there any other solutions possible?

Thanks for your help.

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