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

I am getting message "An error occurred while sending mail. The mail server responded: 5.7.1 Authentication Required." How do I fix this?

  • 5 replies
  • 30 have this problem
  • 692 views
  • Last reply by christ1

more options

For the past week I cannot send email. I receive email fine but when I try to send I get this message: An error occurred while sending mail. The mail server responded: 5.7.1 Authentication Required. Please verify that your email address is correct in your Mail preferences and try again."

I do not know where Mail Preferences is--I have looked for it. Please help or I will need to get another email platform since being able to send is as important as receiving.

Thank you.

All Replies (5)

more options

Is your question about the Thunderbird email client?

Because this thread is in the Firefox support queue, and Firefox doesn't "do" email. Or is you question about webmail that you access through Firefox?

more options

My apologies, yes, my issue is with Thunderbird, that is where the email problem is.

more options

Moving to the Thunderbird product support queue.

more options

Does anyone have an answer to this problem so I can get my Thunderbird to work again? Please help!