Office 365 Block Emails with attachments

I'm trying to create a distribution group that will accept emails only if they don't have attachments. I've created the group and confirmed that it works. I'm now trying to create a mail flow rule but the rule isn't working. I've attached a screenshot showing how the rule is set up. What am I doing wrong?

Mail Flow Rule
LVL 22
Russ SuterSenior Software DeveloperAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Vasil Michev (MVP)Commented:
Try the "includes any of these recipients in the To or Cc box" predicate, or in other words Apply this rule if ->  "The message" -> "To or CC box contains...".

Also, the Generate incident report action only applies to DLP if I remmeber correctly.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Office 365

From novice to tech pro — start learning today.