Invalid HELO Name when connecting to Email Server

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 ‘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 ‘Email 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’.

Microsoft Outlook Latest

1. Go to the ‘File’ Menu and click ‘Settings’.

2. Click Your Email Account.

3. Under ‘Sever Information’ click on ‘Configure’.

4. Click ‘More Options’.

5. Ensure either ‘Use incoming server information’ is ticked, or if you use a different incoming server to your outgoing, ensure that the email address and password is filled in correctly.

6. Click ‘Save’.

Thunderbird

1. From the Side Menu click the ‘Settings Cogwheel’ and then click on ‘Account Settings’.

2. Click on "Outgoing Server" at the bottom of the list in on the left side of the window.

3. 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’.

Mac Mail

1. From within Mail, Click Mail > Settings > Accounts > Click Your Mail Account > Server Settings.

2. Near the bottom of the window, look for the ‘Outgoing MailServer (SMTP)’ section.

3. Uncheck ‘Automatically manage connection settings’

4. From the ‘Authentication’ dropdown menu select ‘Password’.

5. You can now close the window.