auth_psa reject error after changing distribution from OpenSuse to Ubuntu

[bebored]

Hi,

i changed the distribution of my server from OpenSuse to Ubuntu. I made a backup with plesk before and restored it on Ubuntu (Plesk 10.4.4). Everyting looks fine but i cant log into any mail account. Everytime i got the auth_psa reject error. Passwords are correct. Disabling/Enabling Domains and Mailaccounts didnt work. If i delete a domain and set it up new, and then setting up a new mail account, it will work. But well, thats not a good option. Oh and i cant log in with horde or atmail either.

I tried:
mchk --with-spam
Disabling/Enabling Domains and Mailaccounts
Rebooting

Hope anyone can help...

Regards,

Matthias