[Dovecot] Where can I find a stable PPA?

Hello,

As the subject says, where can I find a stable PPA of Dovecot v2.2 for Ubuntu 12.04?

I found this https://launchpad.net/~kokelnet/+archive/dovecot22, but the description says, "...I declare them as unstable."

For obvious reasons, I don't want to use this.

What should I do?

Thanks,

Daniel