Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

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
This thread was archived. Please ask a new question if you need help.
Archived

Apparently I cannot receive or send emails from the company that handles our complaints. I get the same error message when sending.

Thunderbird Troubleshooting
user01229325 replied 11 years ago
tonyashmore
tonyashmore

An error occurred while sending mail. The mail server responded: Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record. Please check the message recipient.......and try again.

An error occurred while sending mail. The mail server responded: Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record. Please check the message recipient.......and try again.

All Replies (1)

user01229325
user01229325

This error is about DNS records and is from the providers server. Contact them since this has nothing to do with Thunderbird other than it delivered the message.