xlabels

[Luis Mochan]

> I believe that offlineimap inserts an
> 
>   X-OfflineIMAP*
> 
> header which is what it uses to see if a message is new.  It works
> on the principle that messages are immutable, which is part of the
> IMAP standard.  But if you remove that header, offlineimap will think
> that the message was deleted and that a new message appeared, and
> that should do the right thing.

Thanks Dan for the clear explanation!