Watchguard blocking attachments of only one user (Urgent)

edited February 2020 in Firebox - Other

Dear Team.

We are using Watchgurad Firebox M200 with Total Security Suite.

we facing very critical problem, our one user is not receiving any attachment from specific domain showing text file only in that written: (other all are receiving same attachments)

The WatchGuard Firebox that protects your network has detected a message that may not be safe.

Cause : The file type may not be safe.
Content type : application/ms-tnef
File name : winmail.dat
Status : File Name violation
Action : The Firebox deleted winmail.dat.

Your network administrator can not restore this attachment.

Please help


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