[Dovecot] Unknown password scheme SSHA512

[Patrick Westenberg]

Hello,

I installed dovecot via Debians apt package manager.
The passwords are stored as SHA256 hash in a PostgreSQL database.
default_pass_scheme in dovecot-sql.conf is set to SHA256.
However, smtp-auth fails.

Jul 24 00:31:07 smtp01 dovecot: auth(default): 
sql(mail at jasbafliesen.de): Unknown password scheme SHA256

Can anybody help me?

Regards
Patrick