One of the things I would like is a "reviewed" flag on the grid ...
I often have 100 to 150 mails to review so I start to work down the list and according to the rules of murphy's law (http://en.wikipedia.org/wiki/Murphy%27s_law) as soon as I get near the end of the list MWP does another fetch and sorts the new emails in amongst the ones I have already reviewed so now I have to start again.
Having a "reviewed" flag and an additional "wash reviewed" function would allow me to wash out the ones I have already reviewed leaving the ones I have not yet done .....
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If Mailwasher could check multiple ( at least 2) pop accounts and launch separate e-mail programs for each differently
example one could Thunderbird for one and Outlook for the other this would be great
There could be split screen on check or a split process button to process just one account if a person did not want to check the other
This would be great for shopping or work e-mails to keep separate from the primary