Re: [Dovecot] Master user and proxying

[ID 583609 mail.info] auth(default): passdb(pierre,127.0.0.1,master): Master user logging in as account@test.fr*pierre

sounds like your proxy tries to login to destination as account@test.fr*pierre*pierre . Which of those two sql statements did u use for this log? "'%u*pierre' as destuser" or "'%u' as destuser" ? What does the other setting tell you in the destination log?