Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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

Second email not being authenticated - weeks of conversations with Comcast

  • 4 replies
  • 1 has this problem
  • 29 views
  • Last reply by Rick

more options

I got a new computer six weeks ago. A large portion of that I have been trying to get Thunderbird to work. I have been on the phone for hours and hours with comcast, going over settings to no avail. I have deleted and reinstalled Thunderbird over and over.

This time a screen wants to connect to Xfinity and then says the connection was refused. Interestingly I have conneted in the past and can get the history of emails to download, but not able to send emails. I have messed with the outgoing port, and various combinations. Usually the "Continue" key gets grayed out. And I can't do anything.

I have used Thunderbird for twenty years I'm certain. I'm about to give up and switch. I don't know what else to do.

I got a new computer six weeks ago. A large portion of that I have been trying to get Thunderbird to work. I have been on the phone for hours and hours with comcast, going over settings to no avail. I have deleted and reinstalled Thunderbird over and over. This time a screen wants to connect to Xfinity and then says the connection was refused. Interestingly I have conneted in the past and can get the history of emails to download, but not able to send emails. I have messed with the outgoing port, and various combinations. Usually the "Continue" key gets grayed out. And I can't do anything. I have used Thunderbird for twenty years I'm certain. I'm about to give up and switch. I don't know what else to do.

All Replies (4)

more options

I have saved some notes from others who posted here with Comcast issues, so maybe some of these links will be useful:

The correct incoming server is imap.comcast.net for IMAP or pop3.comcast.net for POP, plus you have to enable access to the account by mail apps like TB: Set Port to 587 Set Connection Security to : STARTTLS for SMTP smtp.comcast.net, normal password

https://www.xfinity.com/support/articles/third-party-email-access
https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email
https://www.xfinity.com/support/articles/third-party-email-access
more options

Thanks David..

When I alter the outgoing SMTP and enter the info you provided, it tries to connect to Xfinity and shows this, as has been happening multiple times.

more options

Wow!! I’m not even sure what I did differently. Repeated what I’ve been doing. And for some reason it worked.

Hallelujah!!! Thanks much!!!

more options

mrwayyne said

Thanks David.. When I alter the outgoing SMTP and enter the info you provided, it tries to connect to Xfinity and shows this, as has been happening multiple times.

The reference to “localhost” may suggest something like a firewall or a hosts file that interrupted the DNS lookup (as the message says). Thunderbird could not find Xfinity/Comcast.

You may still have to deal with that if the problem recurs.

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.