once I learned to install the evolution plugin, I was able to configure mail-notification to look at my evolution inbox. Unfortunately, it crashed immediately, when trying to display a summary popup of the ~500 unread messages in that folder. The crash was due to some X error, so I assume it is just trying to create a humongous window to show all the messages. As a rule of thumb, never make popups larger than the screen. And displaying a summary of 100s of messages is probably not very helpful in the first place. So maybe restricting the popup to a most screen height and at most the first, say, 10 messages might make this tool a lot more useful.
reported upstream https://savannah.nongnu.org/bugs/?18196
Answer from upstream deeloper: --- It's X's job to not crash when displaying a huge window. Anyway, that popup code is gone in what will become the next version (libnotify is now used). For now you should simply refrain from monitoring mailboxes which contain that many unread mails (I see no point in doing so anyway). If you can no longer use MN because it crashes at startup while trying to display the huge popup, just remove the offending mailbox from ~/.gnome2/mail-notification/mailboxes.xml manually. --- So a fix will be in the next version. Sorry, that solution is far from perfect, but I don't hae the manpower to fix that on my own.