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

Mozilla Thunderbird email error message

  • 1 reply
  • 1 has this problem
  • 13 views
  • Paskiausią atsakymą parašė sfhowes

more options

Hello, I've recently started getting this message with some emails I send with attachments, "An error occurred while sending mail. The mail server responded: esmtp: protocol deviation"

Hello, I've recently started getting this message with some emails I send with attachments, "An error occurred while sending mail. The mail server responded: esmtp: protocol deviation"

All Replies (1)

more options