I found this on a Google search..
"Cyrus can use different SASL (Simple Authentication and Security Layer) mechanisms, the default being sasldb (it stores usernames and passwords in the SASL secrets file sasldb), but also getpwent, kerberos4, kerberos5, PAM, rimap, shadow and LDAP are supported.
Since I don't want to define users/passwords different than the ones that access my Linux® box I choose then “shadow” mechanism so Cyrus will use Linux® passwords for authenticate."
Depending on where you want usernames & passwords stored will depend on how to add them..
"shadow" will allow existing linux users to access cyrus
"sasldb" users are added with the command cyradm --user username
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