You can use sasldb2 for authentication, to add users use:
saslpasswd2 -c username
If you want to enable SMTP AUTH with the system Sendmail, read
Sendmail.README
NOTE: This port has been compiled with a default pwcheck_method of
auxprop. If you want to authenticate your user by /etc/passwd,
PAM or LDAP, install ports/security/cyrus-sasl2-saslauthd and
set sasl_pwcheck_method to saslauthd after installing the
Cyrus-IMAPd 2.X port. You should also check the
%%PREFIX%%/lib/sasl2/*.conf files for the correct
pwcheck_method.
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