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My personal email account has 0 for the size limit, priorities area has 100 MB but when I try to send an email via Mac's Mail app connected to exchange (El Capitan) it was my mail server has an error. I had to check the option to send large attachments through mail drop.
Why can I not send a 20 MB zip file as an attachment??? I looked over all of the settings for my domain and my user and cannot find out what is preventing this.