Plaintext authentication disallowed on non-secure (SSL/TLS) connections

I am unable to login for email in Outlook 2013 using plaintext authentication. I can login with secure settings.

[root@host ~]# dovecot -n

auth_mechanisms = plain login disable_plaintext_auth = no first_valid_uid = 1000 mail_location = maildir:~/Maildir mbox_write_locks = fcntl namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { driver = pam } protocols = imap pop3 ssl = required ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { driver = passwd } local_name charlesleonardsteelservices.com { ssl_cert = </home/clss/ssl.cert ssl_key = </home/clss/ssl.key } local_name www.charlesleonardsteelservices.com { ssl_cert = </home/clss/ssl.cert ssl_key = </home/clss/ssl.key } local_name rodgersdevelopmentcompany.com { ssl_cert = </home/rodgers/ssl.cert ssl_key = </home/rodgers/ssl.key } local_name www.rodgersdevelopmentcompany.com { ssl_cert = </home/rodgers/ssl.cert ssl_key = </home/rodgers/ssl.key }