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What does this error mean? What can I do to avoid it?
I've googled several sites but couldn't get a definite answer.

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1 Answer

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This is the server side error. It is generated by the server.
In most cases it means that the message was deleted and can not be fetched.

There is really a way to avoid it.
If server decided it can't retrieve an email, it may raise this error.

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