Kmail and dropping lines

[cr]

Periodically, usually after rain, Telescum's waterlogged lines start 
transmitting more noise than signal, and my modem has to fight to extract 
anything agonisingly slowly from the mess.   Every now and then it just drops 
off the line.   All attempts to get Telescum to fix their lines are met with 
evasion and denials.    

Kmail, so far as I can tell, first downloads all waiting messages (maybe ~ 100 
messages including spams) then, after that, tells the server to delete them 
one by one  (I think that's what happens from watching KPPP's graph).   
Trouble is, if the line drops after 50 or 95 messages, they don't get deleted 
so all 100 are still there on the server when I try again.   

So my question - is there any way to tell Kmail to delete each message off the 
server immediately it's been downloaded?    (I'm using KPPP, Kmail, POP and 
SMTP).

Next question - if the server's been inactive for several minutes, is there 
any way to make Kmail send a 'resume' or a 'download' request again in the 
hope of waking it up?    (KPPP's graph seems to show that, if I just 
click 'Check mail' while it's part-way through the days' messages, nothing 
happens - it doesn't send anything to the server.)

Any help welcomed.

cr
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