When you add a new email account, you need to type in your SMTP parameters.
You can usually find them on your email providers docs.
Email address : your email address
Reply-to email : your email address (leave it blank ONLY if your account can't receive emails)
SMTP Host: smtp.example.com
SMTP Port : 25 (if this don't work try 587 or 465)
SMTP Protocol : TLS (if this doesn't work try with SSL)
SMTP Username : your smtp username (available on your email service provider doc).
SMTP Password : your smtp password (available on your email service provider doc).
Hit the Test & Save button and you'll receive a confirmation email.
If not, try again with other ports and protocol.
If you couldn't succeed, please contact us.