Yes I use Microsoft Outlook manual configuration using this simple smtp settings cpanel provided
Mail Server Username: admin+mydomain.com
Incoming Mail Server: mail.mydomain.com
Supported Incoming Mail Protocols: POP3, POP3S (SSL/TLS), IMAP, IMAPS (SSL/TLS)
Supported Outgoing Mail Protocols: SMTP, SMTPS (SSL/TLS)
port 26
ssl port 465
when I check require logon using Secure Password Authentication + ssl port 465 and run test account settings it says failed logon to mailserver. but when uncheck + use port 26 and run test account settings again it will log me in but send a test email message failed and this is the error.
Send test e-mail message: Cannot send the message. Verify the email address in your account properties. The server response:550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
done editing /etc/alwaysrelay and added my ISP IP address.