Moving or "upgrading" from MD5 to SSHA512

[Darren Pilgrim]

On 1/9/2015 4:07 PM, Jyri Hovila [Turvamies.fi] wrote:
> Hello, world!
>
> I have a long-running Dovecot & Postfix installation using PostgreSQL
> back-end.
>
> Until now I've been using MD5 hashing but would like to "upgrade" to
> the salted SSHA512.
>
> Is there a way to configure Dovecot so that it would automatically
> detect the type of the hash stored in the database, so that users who
> have changed their password (and thus being hashed with SHA512) and
> users still having an MD5 hash would both be able to authenticate at
> the same time?

Have a read of this:

http://wiki2.dovecot.org/HowTo/ConvertPasswordSchemes