digest-md5 scheme generation was broken if username didn't contain @domain. Broken by previous change to it.
digest-md5 scheme generation was broken if username didn't contain @domain.
Broken by previous change to it.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot