CLARENCE KRUEGER wrote:
About the 1st of October an error message comes up when I attempt to send an 
email.  Message is:


! An error occurred while sending mail.  The mail server responded: 5.1.0 
Authentication required.

   Please verify that your email address is correct in your Mail preferences 
and try again.


                                               [   OK   ]


I understand that this same error is happening to a number of Mozilla emails, 
e.g., Thunderbird.  Some entry in the Preferences section must be changed to 
avoid this.  Can anyone help.  If not, I'll have to say goodbye Mozilla.


Does this mean you are using Comcast? Or is this a problem with another SMTP account? There have been a couple of similar requests here recently, one of them was "problems sending email" by "jim" 8 days ago. My guess would be that Comcast have changed their requirements. Go to their site and check what they now require for Thunderbird. To actually make the change, you want "Mail and Newsgroups Account Settings..." (there are a couple of ways to get there) and then go down to "Outgoing Server (SMTP)" and "Edit" the necessary.

There were two threads here in the last few days of September:
Yahoo e-mail not working with SM v.2.49.4  and
Yahoo e-mail not working with SM v.2.49.5

(both by Henrik37) where Yahoo / AT&T imposed requirements which cannot currently be met by Seamonkey, Thunderbird or (older versions of?) Outlook. The requirement was OAuth2 (which SM and TB offer) but with some extra wrinkle. If Comcast are going the same way you really need to look at those threads, in particular the 2.49.4 one.

--
spammus ergo sum, viruses courtesy of https://www.nsa.gov/malware/
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