Mal den Zugriff auf den Mailordner checken:
1. Via SSH (o. ä.) mit Ei verbinden
2. Navigieren in den Ordner /var/mobile/Library/mail
3. Rechte des Mail Ordners checken ggf. auf 777 (via 'chmod -R 777 *) setzen
Bei FW 1.1.3 gabs mal den Sync-Fix. Vielleicht funktioniert dieser auch mit 2.0. Unter FW 1.1.4 hat dieser auch teilweise geholfen.
Manchmal hat auch der Wiederherstellungsmodus geholfen.
Natürlich kann es auch am Mail-Provider liegen: Wartungsarbeiten ...
Noch einen Tipp (adaptiert von
http://www.ben.geek.nz/fixing-iphone-mai...-firmware/):
The problem is the user privileges to the directory that your mail is stored in is owned by user “root” and under 2.0 Mail requires ownership by user “mobile”. The following procedure fixes this.
1. Download MobileTerminal from Cydia if you haven’t already done so (it’s in the Featured Packages section).
2. Open MobileTerminal – this looks like the Terminal on a Mac or the Command Prompt on a PC. It’s very small so you have to type very carefully. If you’re not familiar with UNIX commands type very very carefully and pay attention to Capital Letters. The Commands you will enter are case sensitive. Type everything within the quotes (but not the quotes).
3. Enter “su” press return
4. You will be prompted for a password, enter “alpine” press return (if you’ve already changed the root password enter your new password).
5. Enter “cd /var/mobile/Library” press return (Note the capital L in Library)
6. Enter “chown -R mobile:mobile /var/mobile/Library/Mail” press enter (note the capital letters again)
All fixed, you’re done, exit MobileTerminal and the Mail app should work