Smarthost

Send mail using a smarthost
The server will attempt to send emails directly to destination (recommended in most cases). Selecting instead to sent through a smarthost, it will attempt to deliver them through the ISP's SMTP server (recommended in case of unreliable connection or Residential ADSL, dynamic IP, etc).
Host Name
The name of the mail server of the provider.
Port
The port of the mail server of the provider.
Username
If the provider's server requires authentication, specify the username.
Password
The password required by the provider.
Allow non-encrypted connection
Normally, if using an authenticated connection (with username and password), an encrypted connection is required to protect the password. Selecting this option will permit a non-secure connection to connect to the provider (not recommended, use only if ISP has problems).