Proofpoint - Attachment gets rejected

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Scholar

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?

1 ACCEPTED SOLUTION

Accepted Solutions
Superuser

Betreff: Proofpoint - Attachment gets rejected

an XLSB file is natively a ZIP file with a number of substrutures, that can easily sum up beyond 20. Try increasing the depth to 30 for a test.
If that still fails you better send the file to the labs, it might contain a ZipBomb.

Matthias
----------
perComp is a Platinum Partner of F-Secure since 1994. Any advice or help given by me in this forum is voluntarily and to my best knowledge based on working with the products since 1997. Direct contact for customers please check our homepage http://www.percomp.de

2 REPLIES 2
Superuser

Betreff: Proofpoint - Attachment gets rejected

an XLSB file is natively a ZIP file with a number of substrutures, that can easily sum up beyond 20. Try increasing the depth to 30 for a test.
If that still fails you better send the file to the labs, it might contain a ZipBomb.

Matthias
----------
perComp is a Platinum Partner of F-Secure since 1994. Any advice or help given by me in this forum is voluntarily and to my best knowledge based on working with the products since 1997. Direct contact for customers please check our homepage http://www.percomp.de

Scholar

Betreff: Proofpoint - Attachment gets rejected

Thank you, this worked!