Incorrectly removing an infected file

Hello,

I am trying to send an email from my work, Outlook, to personal, Gmail. 

I am sending a .zip file of a pdf because the pdf is too large to attach by itself. 

I get the error code below, any help would be apprecaited.

Microsoft Forefront Protection for Exchange Server removed a file since it was found to be infected.
File name: "winmail.dat->Final.zip"
Malware name: "Exceedingly compressed size"