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Posted by
Visitor
Member Since: ‎06-20-2011
Posts: 4

Can't Send Email from Mozilla Thunderbird

Might anyone know why I can receive comcast mail via Mozilla Thunderbird, but can't send email from Thunderbird?  I'm running Thunderbird V3.1.10.  The error message is....

 

Sending of message failed.
The message could not be sent because the connection to SMTP server smtp.comcast.net timed out. Try again or contact your network administrator.

 

Any help would be appreciated



Posted by
Email Expert



Member Since: ‎05-21-2006
Posts: 29,369

Re: Can't Send Email from Mozilla Thunderbird

[ Edited ]

Which port are you using for smtp?  Do you have SSL on or off?



Need Email Help? Please post the following information in your post.
Do you use XfinityConnect? The Full or Lite version?
Do you use an email client? Which one? (Eg; Windows Live mail, Outlook, a smartphone etc.)
Which browser/version do you use? And- have you cleared your browser cache?
Which operating system? XP, Vista, Windows 7, Mac OS X
Details of the problem you are having.




Posted by
Networking Expert



Member Since: ‎07-28-2003
Posts: 24,238

Re: Can't Send Email from Mozilla Thunderbird

From JR's instructions for Thunderbird setup:

 

Outgoing Server (SMTP):
Settings
Description: Comcast
Server Name: smtp.comcast.net
Port: 587

Security and Authentication
Use name and password is checked
User name: my Comcast user name
Use Secure Connection: TLS button is selected (this is special for Thunderbird).

Posted by
Email Expert



Member Since: ‎03-10-2004
Posts: 6,888

Re: Can't Send Email from Mozilla Thunderbird

 

Here are some helpful screenshots:




JR

Posted by
Visitor
Member Since: ‎06-20-2011
Posts: 4

Re: Can't Send Email from Mozilla Thunderbird

Big thanks to each of you for sending a response.  My configuration matches what was provided by you all. However, it still isn't working..  I can't seem to post the screen shots. 











 

 





 

Posted by
Email Expert



Member Since: ‎03-10-2004
Posts: 6,888

Re: Can't Send Email from Mozilla Thunderbird

What anti-virus program are you using?    Is it checking incoming/outgoing mail?   If so, you can turn that part off as both incoming and outgoing e-mails going through the Comcast e-mail servers is put through virus scanning by Comcast.

 

JR

Posted by
Email Expert



Member Since: ‎04-27-2004
Posts: 18,241

Re: Can't Send Email from Mozilla Thunderbird

Open a Command Prompt window and type:

 

telnet smtp.comcast.net 587

 

Do you get a message ending with "ESMTP server ready"?

Posted by
Visitor
Member Since: ‎06-20-2011
Posts: 4

Re: Can't Send Email from Mozilla Thunderbird

  1. Because I made the changes, as proposed above, I could no longer retrieve mail.  So, I had to change Account Settings - Security Settings: Connection Settings = None and Authentication Method = Password Transmitted Insecurely.  I'm now back to retrieveing mail, but still can't send.  Also had to change server settings to None & Password transmitted Insecurely.
  2. Suspended virus scan on Norton - didn't help
  3. Suspended Firewall on Norton - didn't help
  4. Suspended all Norton pgms - didn't help
  5. Used command prompt to perform telnet - got error "telnet is not recognized as an internal or external command, operble program or batch file". 
  6. Tried pinging smtp.comcast.net - got "General Failure"
  7. Tried pinging comcast.net - got timeout

Ugh - any other ideas?  Should I be able to ping smtp.comcast.net?

Posted by
Visitor
Member Since: ‎06-20-2011
Posts: 4

Re: Can't Send Email from Mozilla Thunderbird

UPDATE:  Finally Successs

 

Set SMTP server config as follows:

Port = 25

Connection Security = STARTTLS

Authentication = No Authentication

 

Set Server Setting/Security Settings as follows:

Connection Settings = None

Authentication Method = Password Transmitted Insecurely

 

 

Posted by
Networking Expert



Member Since: ‎07-28-2003
Posts: 24,238

Re: Can't Send Email from Mozilla Thunderbird

[ Edited ]

Yes, port 25 use doesn't require authentiction unless you are outside the Comcast network, like at a hotel or hotspot somewhere.  Also, many people are having port 25 blocked by Comcast at the cable modem, so I highly recommend you to switch to 587, STARTTLS, and simple password authentication.

 

And no, smtp.comcast.net does not respond to ping.

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