Invalid HELO Name when connecting to Email Server

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In some cases, you can receive this error when connecting to our mail servers. In many cases, this is because you are failing to set Outgoing Server Authentication in your Mail Client.

Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

If you are receiving "550 Access denied - Invalid HELO name" (or a similar error message) in your email client, you can use the below examples to ensure that you're correctly authenticating to the server, and rule this out as a cause.

Microsoft Outlook 2010 / 2013

  1. From the Menu Bar, Click the "File" tab.
  2. Click the Info tab on the left and select "Accounts Settings". Click "Account Settings".
  3. Select your Email account then Click "Change".
  4. Click "More settings".
  5. Select "Outgoing Server" tab.
  6. Select the box beside "My outgoing server (SMTP) requires authentication".
  7. Select "Use same settings as my incoming email server".
  8. Click "Ok".
  9. Click "Next".
  10. Click "Finish".

Microsoft Outlook 2007 and earlier

  1. From the Menu Bar, Click "Tools" then Click "E-mail Accounts".
  2. Select "View or change existing e-mail accounts" then Click "Next".
  3. Select your Email account then Click "Change"
  4. Click "More settings".
  5. Select "Outgoing Server" tab.
  6. Select the box beside "My outgoing server (SMTP) requires authentication".
  7. Select "Use same settings as my incoming email server".
  8. Click "Ok".
  9. Click "Next".
  10. Click "Finish".

Thunderbird

  1. From the Menu Bar, Click "Tools", then "Account Settings".
  2. This will bring up the Account Settings window where you can click on "Outgoing Server (SMTP)" at the bottom of the list in on the left side of the window.
  3. Back in the middle of the window, select the appropriate outgoing server and click the "Edit" button.
  4. Make sure "Authentication method" is set to "Normal password".
  5. Click "OK" to close the SMTP edit window and again on the Account Settings window.

Mac Mail

  1. From within Mac Mail Click Mail > Preferences > Accounts
  2. Near the bottom of the window, look for "Outgoing Mail Server (SMTP)", click the drop down arrow and select "Edit SMTP Server List..."
  3. Click the "Advanced" button in the middle of the window and make sure Authentication is set to "Password".
  4. Click "OK" to close the edit window
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