iRedMail stores (salted) MD5 encrypted passwords for MySQL and PostgreSQL backends by default. Example:
$1$ozdpg0V0$0fb643pVsPtHVPX8mCZYW/- Plain MD5 is supported too. Example: 900150983cd24fb0d6963f7d28e17f72, {PLAIN-MD5}900150983cd24fb0d6963f7d28e17f72.
- Plain password is supported, but it's not recommended. Don't use it on production server.
- Upcoming iRedAdmin (both open source edition and iRedAdmin-Pro) supports SSHA and SSHA512 encrypted passwords.
Reference: http://www.iredmail.org/forum/topic4220 … ha512.html
Refer to Dovecot wiki for more password schemes: http://wiki2.dovecot.org/Authentication/PasswordSchemes