[fetchmail]fetchmail only skipping seen messages when there are no unseen ones on imap

[Christian Uebber]

Rob MacGregor schrieb:

>The problem is simple - you've specified keep (ie don't mark as
>downloaded) without enabling UIDL support (see the man page).  That
>way, fetchmail doesn't know what it's seen and what it hasn't.
>
>  
>
UIDL shoudn't be needed for imap, since imap implements server side 
tracking of seen states. As far as I know UIDL is supposed to be used 
with POP3 only to achieve there what imap is able to do out of the box.

Excerpt from the fetchmail man page:

"The  UIDL code is generally flaky and tends to lose its state on errors 
and line drops (so that old messages are re-seen).  If this happens  to 
you, switch to IMAP4."