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From: John Sullivan <john@wjsullivan.net>
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Subject: Re: IMAP and IDLE...
Date: Fri, 01 Apr 2011 19:11:35 -0400
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> James Cloos <cloos@jhcloos.com> writes:
>
>> If you run g, wait for some new mail to arrive, and only then enter the
>> group, the new mail does not show.  But, I bet, that unseen mail still
>> gets marked read (or otherwise modified) when you exit the group.  And
>> thus appears to gnus to be old the next time you enter that group.
>
> It's possible...  but Gnus only sends the marks delta to the server, so
> if Gnus doesn't know about message X, it won't send any data to the
> server about message X.
>
> I think.

That sounds like a credible explanation, but on the other hand, when
I've tried to reproduce it that way, I can't. I can definitely say that
not *all* of the unseen mail gets marked read that way.