Sent folder messages all show error

[brrrknee]

Each message which is sent (successfully btw)has error: NO mailbox does not exist. Press send to try again.
Is there some odd setting causing this error?  It doesn't reflect the fact that the messages are delivered.  Using IMAP and all other aspects of the email client work as expected.

Sent from my VS980 4G using Tapatalk

[Kostya Vasilyev]

It's trying to upload your sent messages, and the server side folder seems to have disappeared, maybe renamed.

You can do two things:

1 - Long press the account -> options and folders -> folders -> find the server side Sent folder, tap it, choose "Sync with Sent"

or

2 - Remove the account from Aqua, add back. This will re-query the server for the names of those "special" folders.