Also make sure /etc/mail/mailer.conf is properly set up, for postfix it should be:
Code:
sendmail /usr/local/sbin/sendmail
send-mail /usr/local/sbin/sendmail
mailq /usr/local/sbin/sendmail
newaliases /usr/local/sbin/sendmail
hoststat /usr/bin/true
purgestat /usr/bin/true