You may want to use a proxy server for external communications for Symantec Email Submission Client.
To specify the proxy configuration
In the Email Submission Client user interface, click the Proxy Configuration tab.
Select Use a proxy server for all external communication.
In the Address field, type the proxy server address.
In the Port field, type the port for the proxy server.
Select the Authentication Required option, if the proxy server has a user name and password.
In the User name field, type the user name.
In the Password field, type the password.
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