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In the left pane right click on the Email account you are having issues with (ex: yourusername@gtconline.com), and then click on Settings.
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In the Account Settings window make sure the account name is yourusername@gtconline.com, then click on Server Settings on the left.
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In the server settings window make sure the settings are as follows:
imap.gtconline.com Port 143
Username: yourusername@gtconline.com
Connection Security: STARTTLS
Authentication Method: Normal password -
Next Click on Outgoing Server (SMTP), then click on the Edit… button.
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Ensure your SMTP Server settings are as follows:
Server Name: smtp.gtconline.com
Port: 587
Connection Security: STARTTLS
Authentication Method: Normal password
User Name: yourusername@gtconline.com