Office 365 Public Folders HierarchySync_Ping

How to I stop this.. I get a message every 6 minutes.. currently I have a rule to permanently delete it upon receipt.. This is annoying

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Subject: HierarchySync_Ping_151260_81ffdb60-44c8-43a3-bdb1-0f2e040da951
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Date: Sat, 16 Feb 2019 07:24:05 +0000
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David Johnson, CD, MVPRetiredAsked:
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Vasil Michev (MVP)Commented:
That's a standard message exchanged between PF mailboxes, the more interesting question here is why it is getting to you? Looking at the headers, you seem to have some sort of a "catch all" rule configured, or any other type of forwarding that causes this, so I would look into that if I were you.

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David Johnson, CD, MVPRetiredAuthor Commented:
that was it.. was annoying me for months. Thanks for the speedy fix
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