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.

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.

Can't send e-mail

  • 1 reply
  • 1 has this problem
  • 13 views
  • Last reply by sfhowes

jenshayco3
jenshayco3
more options

I am able to send one or two e-mails a day until I receive the error message:

An error occurred while sending mail: The mail server sent an incorrect greeting: resomta-po-19v.sys.comcast.net resomta-po-19v.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available.

I can send and receive directly from Comcast (which is cumbersome) but not with Thunderbird. I have reset my password several times. Win 10, Thunderbird 78.6.0, Norton Antivirus (disabled), Below are my SMTP settings.

This is really driving me crazy and I need to fix it but no idea what to do.

Jen

I am able to send one or two e-mails a day until I receive the error message: An error occurred while sending mail: The mail server sent an incorrect greeting: resomta-po-19v.sys.comcast.net resomta-po-19v.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available. I can send and receive directly from Comcast (which is cumbersome) but not with Thunderbird. I have reset my password several times. Win 10, Thunderbird 78.6.0, Norton Antivirus (disabled), Below are my SMTP settings. This is really driving me crazy and I need to fix it but no idea what to do. Jen
Attached screenshots

All Replies (1)

sfhowes
sfhowes
  • Top 10 Contributor
more options

In the User Name field, omit the @comcast.net part.

https://support.mozilla.org/en-US/questions/1320016#answer-1380031