I followed the instructions to add SASL support to working postfix / dovecot install on Centos 5.
(instructions found here: http://www.linuxmail.info/postfix-smtp-auth-dovecot-sasl/
After changing to require SASL, server always shows:
[root@web1 etc]# telnet mydomain.com smtp
telnet: connect to address 18.104.22.168: Connection refused
telnet localhost pop3 is ok
No messages in maillog or messages.
This is on a hosted Virtual private server. Appears to be using parallels