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Kiril's avatar
Kiril
Iron Contributor
Mar 23, 2023

How to classify E-Mails with *.html or *.htm attachments as spam?

A tenant is receiving currently an enormous amount of phishing emails with *.html or *.htm attachments. 99% of the e-mail which contain such an attachment are phishing e-mails. What's the best approa...
microsoft 365 defender
prevention
threat intelligence
dhilipan's avatar
dhilipan
Copper Contributor
May 28, 2023
If required, you can create a Transport rule to block mails with HTML or HTM attachments and even use exclude options for trusted senders.
  • alecfunes's avatar
    alecfunes
    Copper Contributor
    Jun 09, 2023

    dhilipan 

    Would you be kind enough to tell me how to that? ("create a Transport rule to block mails with HTML or HTM attachments")

    Thanks!

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