Most outgoing mail servers require that you use SMTP Authentication when configuring your email client. This information tells them that you are authorized to use their outgoing SMTP mail server. Authentication is usually in the form of an email address or user ID and a password associated with that ID. When you don’t have SMTP Authentication configured in your email client, you are likely to get errors such as:

To add or modify the SMTP User Authentication in GroupMail, click on Tools/Account Manager (or Manage Accounts) and click “Modify” for the sender identity you wish to change. Then, click on the “Delivery Options” tab and check the “Requires Authentication” box under your SMTP server address. Click “Setup” to make the changes.

Then, check the “Use SMTP Authentication (outbound)” box and enter your user name and password for that mail server. Most SMTP mail servers will use the default AUTH Login, but there are other authentication types available, such as NTLM Authentication which is often used for Exchange Servers.

Then, click OK to save those settings and OK again to exit the Account Properties screen.

Consider yourself authenticated.