Server switching

[The Doctor]

Quick question.

We are using both IMAP and POP#.

Question : 
how can you avoid retrieving an e-mail that has been already retrieved?

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Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca
God,Queen and country!Never Satan President Republic!Beware AntiChrist rising! 
http://www.fullyfollow.me/rootnl2k  Look at Psalms 14 and 53 on Atheism
 If you want to catch something, running after it isn't always the best way.  -Lois McMaster Bujold