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

Sometimes cannot send email

  • 5 replies
  • 0 have this problem
  • 1 view
  • Last reply by david

more options

Sometimes I can't send email. Sometimes I can. When my message won't send, I get this error message... "Sending of the message failed. An error occurred while sending mail. The mail server responded: Please ensure your email address and authenticating user match when sending messages. Please verify that your email address is correct in your account settings and try again."

If it works sometimes and not others, how can the configuration be wrong?

How can I fix?

This is recent problem... likely since a T-Bird update. Prior, had worked normally.

Thanks.

Ron H.

Sometimes I can't send email. Sometimes I can. When my message won't send, I get this error message... "Sending of the message failed. An error occurred while sending mail. The mail server responded: Please ensure your email address and authenticating user match when sending messages. Please verify that your email address is correct in your account settings and try again." If it works sometimes and not others, how can the configuration be wrong? How can I fix? This is recent problem... likely since a T-Bird update. Prior, had worked normally. Thanks. Ron H.

Modified by gnome99

All Replies (5)

more options

Posting info on your SMTP settings may prove useful.

more options

Not sure if this is what you want...

Description = Comcast Server Name = smtp.comcast.net Port = 465 Default = 465

Security and Authentication Connection security = SSL/TLS Authentication method = Normal password User Name = gnome99@comcast.net

Thanks

more options

Is that email the same as on the incoming server setup? I suggest trying 587. And then trying 587 and STARTTLS. No reason, except I see email providers sometimes change their requirements.

more options

I've run tests to myself. Some go through, some get the error message. Doesn't seem likely that changing the server settings is the answer..  ??

more options