Not receiving test e-mails to self with large attachments sent through Exchange Server 2013 EWS


I am currently evaluating em Client for use.  I have run across a problem in where if I send an e-mail with an attachment above 20 megabytes to myself and others through Exchange 2013 EWS, the message will not download into em Client.  All other messages below this threshold arrive in the Inbox without issue for this e-mail account.  I do not experience this problem with Outlook.  Thanks.