An approach to mixing lave & historic email

All,

I'm trying to achieve something using fetchmail and I seem to rather 
"swimming against the tide". I
wonder if a different approach is in order.

I run an SMTP server @ home (actually called smtp.home [via CNAME] ) and 
I have recently
rented use of smtp.remote (not it's real name)

Stage1:  I did fetchmail(imap) every 5 minutes of smtp.remote (using 
fetchall option) and delivered to smtp.home
          People then read email via Thunderbird via imap to imap.home 
(dovecot access to local files)


All works well, but you can only send and receive email while you can 
"see" smtp.home (so on local LAN ... no holes in firewall)

So

Stage2: Do the fetchmail(imap) less frequently (e.g. daily) and use the 
keep option (and no fetchall)
         Users can now imap to both imap.home and imap.remote and see 
similar (but more or less up to date)
     views. They can also send mail from both locations.


Stage3: Delete mail from imap.remote older than say 1 year


Now "recent email" is on imap.remote while historic is held on 
imap.home, there is significant overlap.
The idea being , when you're out "on the road" you lack access to 
history but you can deal with current day-to-day issues using a phone.

================ Problems =============

1: Getting copies of "Sent" mail from imap.remote ... Solved using 
maildrop(1) ...needed to save by sender not recipient

2: Mail in inbox at imap.remote that had been "read" by "a phone" , was 
not downloaded by fetchmail(imap)....Looks like the rule
    for --keep and "no fetchall" is only download stuff not already 
"seen" by **somebody**.

What I really want of course is "stuff not already seen by **me**".


Now I note from uidl.c that pop3 does this differently...should I pop 
the mail to achieve the desired effect ... bear in mind
I'd be skipping a years worth of mail to read one message?

...I guess I'm looking for a "cursor" to mark where "I" have downloaded 
to ... so e.g. multiple clients could "mark their place"
and download ...anything after message No XXX.




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