[X-Newbies] Apple Mail Server Question

[Thomas McDermott]

Good evening,
	I was wondering if someone could explain something to me regarding  
how the Mail program handles deleting mail from my server.  On my  
macbook and iPhone I have the mail setting to leave mail on server  
unless I delete it.  When I have used eudora and thunderbird it seemed  
to remove the messages from the server the next time the program  
checked for new mail.  With Mail it doesn't seem to work that way...at  
least not right away.  If I delete a message from Mail, check for mail  
and then shut Mail down right away the message is still on the server  
when I get to my home pc.  If I leave Mail running and it checks mail  
at its assigned interval the messages will eventually be removed from  
the server.  I guess the long winded question is why that is and what  
causes the delay in mail removal?

Thanks

Tom