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

Mulongo oyo etiyamaki na archive. Tuna motuna mosusu soki osengeli na lisalisi

cannot send emails

  • 1 eyano
  • 0 eza na bankokoso oyo
  • 1 view
  • Eyano yasuka ya Toad-Hall

more options

I cannot get emails to send from Thunderbird. I have to copy to Outlook to be able to send.

Sending of the message failed. An error occurred while sending mail. The mail server responded: Client not authenticated to send mail. [MW4PR04CA0246.namprd04.prod.outlook.com 2024-03-01T04:29:11.388Z 08DC38FAF1647BFB]. Please verify that your email address is correct in your account settings and try again.

I cannot get emails to send from Thunderbird. I have to copy to Outlook to be able to send. Sending of the message failed. An error occurred while sending mail. The mail server responded: Client not authenticated to send mail. [MW4PR04CA0246.namprd04.prod.outlook.com 2024-03-01T04:29:11.388Z 08DC38FAF1647BFB]. Please verify that your email address is correct in your account settings and try again.

All Replies (1)

more options

What server settings are you using for the outgoing smtp?

  • Account Settings
  • Left pane scroll to bottom and clickon 'Outgoing Server (SMTP)'
  • You should see a list on the right of all outgoing servers.
  • Select the one used for account and click on 'Edit'
  • Please post an image of outgoing server settings.

Do you have more than one account using outlook server. ? In Thunderbird

  • Help > Troubleshooting Information
  • Scroll down to 'Mail and News Accounts' section
  • Copy all that section and paste into t his question OR post an image showing the info.