Allow list to bypass attachments quarantine by Malware Agent

We have Exchange 2013 CU23 on-premises.  We use Knowbe4 to send phishing test to employees.  Some phishing emails have Word, Excel or Powerpoint attachments.  The malware gents quarantines the attachment and replaces the attachment with a text file.  I have installed the Connection Filtering Agent and added Knowbe4's phishing email server ip addresses using Add-IPAllowListEntry.  The only way to get the email attachment is to set the malware filter to bypass filtering to true.  Knowbe4 uses a sender's email address that is not knowbe4.com.  I added a sample email address to BypassSenderDomains and email attachment was quarantined.  

Does Exchange 2013 on-premises have the ability to bypass the email attachment scan using a whitelist?

Thanks for all replies.

Jason M.