"Cannot Send Mail - Your mailbox is full" error when you use iPhone mail to send very large attachments (KB5004622)

When you try to use your iPhone or iPad mail app to send an email message that has an attachment that exceeds the size limit, you receive one of the following error messages:

Cannot Send Mail - The message was rejected by the server

Cannot Send Mail - Your mailbox is full

This issue occurs after you install one of the following cumulative updates:

Microsoft is aware of this problem and will post more information in this article when a fix becomes available. 

Learn about the terminology that Microsoft uses to describe software updates.

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