I don't think there is a problem with your ir5050 since you can send PDF's to 15 out of 20 addresses. Usually copier issues are can't send anything at all.
Check your size settings in
System settings-> Communication Settings-> E-mail/I-Fax Settings. I would set it to the same size limit as your Global default on the exchange server.
It's more likely a lower size limit on just those 5 addresses. Look in the properties for those mailboxes for delivery restrictions. Increase receive size.
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