This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

Authentication Failed, must login..

  • 1 antwoord
  • 2 hierdie probleem
  • 1 view
  • Laaste antwoord deur user01229325

more options

I am unable to send emails. I keep receiving this failed message " 5.7.1 [R8] Authentication Failed, must login.." I contacted my cable provider and they are at a loss. I have tried everything but with no luck. My operating system is Microsoft 10. Hope you can help.

I am unable to send emails. I keep receiving this failed message " 5.7.1 [R8] Authentication Failed, must login.." I contacted my cable provider and they are at a loss. I have tried everything but with no luck. My operating system is Microsoft 10. Hope you can help.

All Replies (1)

more options

Post your Thunderbird troubleshooting info. From the Help Menu select Troubleshooting Information. Copy to Clipboard Come back here and paste into a reply window