Proofpoint - Attachment gets rejected

Hi,

 

A customer is trying to send us an attachment (.zip) and its size is ~6MB and its only 1 file.

Why it is not coming through?

 

Status: Rejected
Final Rule: maxsize

 

Firewall rule:
maxsize : size greater than 25MB or Attachment count greater than 256 or Total Umcompressed Attachment size greater than 100MB or File count in archive greater than 256 or file depth in archive greater than 20

 

The file sit 1 (.zip) file with 1 file (.xlsb) and its only 6Mb

 

What should I look next?

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