How to Block Outgoing Mail Attachment XLSM

Question

Servus Guys 
 i have a UTM 9.502-4 and i wanna block XLSM File in Emails Outgoing. 
 
 Any Ideas are welcome. 
 
 Regards 
 Carsten

Carsten Bach · Answer

i got the Issues solved. 
 I did a Exception under Email Protection -- SMTP -- Exception 
 
 Skipping -- Expression blocking: I pointed the Subnet wrong. 
 
 After the correction, no file with XLSM was sent outside