Changing your email server settings
The control panel provides default configuration settings for the email server. You can change these settings to suit the needs of outgoing and incoming mail on your domain.
To change your email settings:
In the shortcuts section of the Home page, click Configuration (Email section).
In the Configuration form, click Edit. The Edit Configuration form opens showing the current SMTP email settings.
In the Maximum Message Size field, enter the maximum number of bytes an email message can contain.
Note: If you do not want to impose a limit on the message size, leave this field blank.
In the Relay Domains field, enter the names or IP addresses of the domains that can use this server as their SMTP mail server.
Depending on whether or not you want the control panel server to authenticate the email source before enabling further relay, select the appropriate Relay Status check box.
Click Update.