Could someone please help me understand why this is happening.

Does not happen with every email I send just on a few and I am not even sure if they are still actually getting sent.

From time to time I get the yellow triangle at the bottom of my outlook which displays the error message.

An unknown error has occurred in Outlook.
A message in your Outbox could not be sent. The account which created the message cannot be found.
Error 17199

If anyone could help, would be greatly appreciated.

Many thanks,

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