[Imap-protocol] Is SELECT required before FETCH to detect new mail?

I have been seeing a problem with mozilla Thunderbird client when using 
the charter.net imap server. When thunderbird checks for new messages it 
just does a FETCH since the inbox was already SELECTed at startup. It 
does not detect new messages unless another mailbox is SELECTed and 
inbox is re-SELECTED and then FETCHed. I think thunderbird is following 
the IMAP spec but charter.net server is not since it requires a 
re-SELECT on and already selected mailbox to signal new email. Am I right?

-gene
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