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user_622255
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Friday, August 30th, 2024 7:36 PM

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New Problem - Thunderbird Not Able to Send Email on One Account - Get Login to server smtp.comcast.net with username Error

I am running Windows 10 and Mozilla Thunderbird as my email client. I have multiple comcast.net email addresses set up and all have been working fine. Now all of a sudden I am unable to send emails from one of my accounts, always getting the error message - Login to server smtp.comcast.net with username [Edited: "Personal Information"] failed.

I have not changed my comcast email password, and even went into both my comcast email account settings for that id ([Edited: "Personal Information"]) as well as the account settings in Thunderbird - all are set to the same password.

Can you help? I need to send an urgent email out from that email account. Thank you in advance for your help or direction.

Best regards,

David [Edited: "Personal Information"]

Question

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Updated 

6 months ago

 • Edited

1.4K

1

0

XfinityAirelle

Official Employee

 • 

2.5K Messages

8 months ago

Hi there! We recommend deleting the account from Thunderbird and re-adding it!

 

To set up your new Comcast email account using IMAP, follow these steps:

  1. Open your email client (e.g., Outlook, Thunderbird).
  2. Navigate to the option to add a new account.
  3. Enter your name, Comcast email address (e.g., username@comcast.net), and password.
  4. Choose IMAP as the account type.
  5. Configure the incoming mail server with:
    • Server Name: imap.comcast.net
    • Port: 993
    • Security: SSL/TLS
    • Username: Your Comcast email address
    • Password: Your Comcast email password
  6. Configure the outgoing mail server with:
    • Server Name: smtp.comcast.net
    • Port: 587
    • Security: STARTTLS or SSL/TLS
    • Authentication: Yes, require authentication
    • Username: Your Comcast email address
    • Password: Your Comcast email password
  7. Verify the settings and complete the setup process.

4

0

user_jo1234

Visitor

 • 

3 Messages

Didn't work for me. I can receive but not send. When I try it sends me to comcast sign-in page (even though my password was entered when I set up the account and it pulled in all my messages), and then it says, "You don't have permission to access "http://login.xfinity.com/login" on this server."

6 months ago

user_j43jfi

1 Message

had same problem...until today when i made the following change:

SSL/TLS and it defaulted to 465 for port....and it worked

6 months ago

0

user_96ealo

1 Message

Not for me. 465 is where the problem was. I changed it to 587 and it just tries to connect and then times out.

6 months ago

0

XfinityAdrienne

Official Employee

 • 

1.2K Messages

Hey there, user_j43jfi! Thank you so much for sharing the fix that worked for you here, we appreciate it! Please let us know if you have any other questions/concerns. 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

6 months ago

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