Ok so I was trying the next step. After getting Postfix+Dovecot working with plain text authentication. I wanted to try TLS. I saw these errors:
warning: xsasl_cyrus_server_get_mechanism_list: no applicable SASL mechanisms
fatal: no SASL authentication mechanisms
Solutions is to yum install cyrus-sasl-plain
Here is the source
TLSv1 has deprecated SSLv3, and Dovecot seems to use it by default, but if that doesn't work then edit configuration files in /etc/dovecot/ directory.
Dovecot SSL Setup:
Dovecot SSL from Official Website
Here is another very useful HOWTO guide:
CentOS + Postfix + Dovecot + SASL + SSL
To check if SSL/TLS is being used:
openssl s_client -connect mail.platinumfactor.com:995
(Thanks to mick_laptop on #dovecot on Freenode for help in testing)
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