Honestly, its a crowded market already. I feel new players wanting to make any real grounds should try to redefine what a mail client should be, similar to what Gmail did to web mail.
Better use of Stars / flagging. I should be able to add the star or flag to the message with one click, not via a pulldown menu or a key command. Then have a smart mailbox in the source pane for items starred, automatically. Shouldnt have to make a smart mailbox to see them.
Mail Tags - something like this built into the app. Maybe a small side panel on every mail that you have open with space to enter keywords and other metadata. Makes it much more usful for creating smartfolders. Again, it should be seamlessly integrated and quick. I have a message open I want to add the metadata instantly. Much quicker than the way iTunes does it for instance (get info, click to comments then add them)
Labelling - similar to the above, but you can predefine your labels. Again, something similar to the way Gmail does it would be superb. Just have a drop down menu with your list of labels there and drop them onto it. Again, its all about the smart folders. With Mail.app, I cant assign two labels to a message. Its still basically the old school folder system. Sure I can copy to another, but this is clumsy.
Anybody seen zimbra? Astonishingly nice for a web mail app. A lot of features could be implemented into Mail.
- For isntance, in Zimbra, if somebody sends you an email saying something like "hey lets go out next Friday", you can hover the mouse over next friday and it picks it up and displays a small calendar to see if yours is free. You can then easily add the event to your calendar right from the message text itself, without having the other person send you an invite.
- This works the same way for telephone numbers. If somebody emails you a telephone number you can right click it and add it to a contact etc.
Ill be back with more later.
http://www.zimbra.com