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iOS 13.3.1 - cannot send any email  



Phone has been working forever, but no all of a sudden, all outgoing mail is saved to Outbox with the following error "Cannot Send Mail. The server rejected one of the recipient's addresses. The message has been placed in your Outbox."

This is the same for two different accounts (one is - so no config required, and the other is an IMAP account on a server I have control of)

Device is configured correctly (it's always worked), and I have tried the same accounts on a different device successfully (i.e. its not a server problem).

Any ideas before I wipe and restore?

The error is very specific. It may not be server-dependent. Have you inspected to make sure there are no errors in one of the recipient addresses?

Definitely no errors in addresses. This happens to ALL recipients from ALL accounts.