Your Email Settings for cPanel hosting accounts through watchthedot.com should be set as follows
SSL / TLS Settings (Recommended)
Username: Your email address
Password: Use the email account’s password.
Incoming Server: Your domain name, eg example.com
IMAP Port: 993
POP3 Port: 995
Outgoing Server: Your domain name, eg example.com
SMTP Port: 465
IMAP, POP3, and SMTP require authentication.
Non-SSL Settings (NOT Recommended)
Username: Your email address
Password: Use the email account’s password.
Incoming Server: mail.yourdomain.com, eg mail.example.com
IMAP Port: 143
POP3 Port: 110
Outgoing Server: mail.yourdomain.com, eg mail.example.com
SMTP Port: 26
IMAP, POP3, and SMTP require authentication.