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iPhone Mail.app… ERRRRRT CRASH

Recently everytime I open mail.app on my iphone the app crashes. I have 2 accounts setup in the app, a personal gMail account and a corp Exchange account. I have a jailbroken iPhone 4 running 4.1.

Keep in mind that it's not the mail.app itself that is causing the problem, tons of people use mail.app with gMail and other accounts with success. It is typically another app interacting with mail.app the contents of the mail itself.

Here are some steps to determine if an account is causing the problem.
1. Disable all accounts in settings.app. Don't remove them just disable the "mail" option.
2. Let the phone sit/idle until the notifications on the mail.app icon go away. Which means there is no longer any data in the app itself. There is probably a better way by shelling into /var/mobile/Library/Mail or something but I had time to wait so blah.
3. Now try to open the app. At this point there are no active accounts so you should get the "add account". If you do not then keep waiting until that screen appears.
4. Try activating each account one at a time, load mail.app, and see if the crash happens.

So now you have isolated the bad account. For some people the crash happens because of mal-formed email. If this is the case some have suggested using a desktop client and removing mail until you find the culprit. But this solution blows because the problem will come back the next time you get a bad email.

For me it wasn't the mail it was another app. There is no "good" way to find the bad app, well unless you have "Crash Reporter" installed(seriously get it and help everyone out), so the rule of thumb is to think of all the other apps that deal with mail(Notified Pro, Grip, LockInfo, Attachment Saver, etc). If you don't use Crash Reporter your best bet is to uninstall each one, one at a time, and use the phone for awhile to determine if that was the cause. If you take this route do a full reboot between each uninstall. Once you find the source of the problem you have 2 options, leave it the way it is, or re-install the offending app and see if there are some tweaks you can make to that apps settings that will fix the problem.

For me I used Crash Reporter which basically "told" me that the problem was in a library belonging to Notified Pro. So I opened "Notified Pro" to see if there were any settings for mail. Sure enough I went to its settings, selected "Manage Alerts", selected mail, and turned off "Log Notifications"(which to be honest was getting a little annoying anyway since I get a new email every 5 minutes or so). Mail.app works fine now