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

tonyashmore
tonyashmore
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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.

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user01229325
user01229325
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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.