If you’re getting the error ” 550 Access denied Invalid HELO” when sending out email in out look . Please double check your email setting to use the following

For outlook

  1. Click Tools then E-mail Accounts…
  2. Select “View or change existing e-mail accounts” and click Next
  3. Select the email account and click Change
  4. Click on “More settings”
  5. Select “Outgoing Server” tab
  6. Tick “My outgoing server (SMTP) requires authentication”
  7. Select “Use same settings as my incoming email server”
  8. Click Ok
  9. Press Next
  10. Lastly, press Finish

 

This will fix the issue and can send mails now :)