• Activating the check box for My outgoing server (SMTP) requires authentication.
• Check that the option use same settings as my incoming mail server.

Here is a short description of how to perform this activation for the most common email programs.

To solve error 550 Access denied - Invalid Helo name when sending emails through your mail program, follow the following steps depending on the mail program you are using:

For Microsoft Outlook 2002 or 2003

• Open Microsoft Outlook 2002 or 2003.
• Click on Tools
• Click on Email Accounts.
• Check the option View or change existing email accounts and click Next.
• Select your email address and click on Change.
• Click on More configurations.
• Click on the Outgoing mail server tab.
• Check the My outgoing mail server (SMTP) requires authentication is checked.
• Check that the option Use the same configuration as my inbound mail server is checked.
• Click on OK
• Click Next and then Finish.

For Microsoft Outlook 2000

• Open Microsoft Outlook 2000.
• Click on Tools
• Click on Accounts.
• Click on the Mail tab.
• Select your email address and click on Properties.
• Click on the Servers tab.
• Check the My server requires authentication check box.
• Click on Settings.
• Check that Use same configuration as the incoming mail server is checked.
• Click on OK and then on Apply.

For Outlook Express

• Open Outlook Express.
• Click on Tools
• Click on Accounts.
• Click on the Mail tab.
• Select your email address and click on Properties.
• Click on the Servers tab.
• Check the My server requires authentication check box.
• Click on Settings.
• Check that Use same configuration as the incoming mail server is checked.
• Click on OK and then on Apply.

For Windows Live Mail

• Open Windows Live Mail.
• Right-click on your email address in the left panel and click Properties.
• Click on the Servers tab.
• Check the My server requires authentication check box.
• Click on Settings.
• Check that the option Use the same configuration as my inbound mail server is checked.
• Click on OK

If you use a Mac, you must follow the following steps for the mail program you use on your Mac:

For Mail (Mac OS X 10.4 or higher)

• Click on Mail.
• Click on Preferences.
• Click on the tab Accounts under outgoing SMTP mail server and click on Server configuration.
• Verify that the outgoing mail server and the server port information are correct.
• Check that the Use Secure Sockets Layer (SSL) option is disabled.
• Check that your Username and Password are correct.
• Click on OK

For Mac Outlook Express

• Click on Tools
• Click on Accounts.
• Click on the Mail tab.
• Select your email address and click on Modify.
• Under Outgoing mail click on Click here for advanced server configuration.
• Select the check box of SMTP Server requires authentication.
• Select Start session with and enter the following information.
• In the Account ID field, enter your full email address. Ex: yourname@yourdomain.com
• In the Password field, enter the password of your email address previously indicated.
• Click on Save password.
• Click on OK in the Edit Account window to save the configuration.