David E. Ross wrote:
On 10/3/2019 2:59 PM, Jim wrote:
David E. Ross wrote:
On 10/3/2019 2:27 PM, Jim wrote:
This afternoon, I started having problems sending email.

I get the message "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."

The email address appears to be correct.


Check to make sure that your currently selected account is the correct
one for you "From" E-mail address.  And vice-versa, make sure that your
"correct" E-mail address is really the one for the account.

I get your problem when I try to send E-mail while my currently selected
account is a newsgroup account.

I tried that and it is correct.  Plus it was working OK last night, and
just started acting up today.  Do you think something got corrupted on
my PC?  Or my ISP is having troubles?


If everything at your end appears okay, yes call your ISP.  Either the
authentication process on their server is bad, or else they may have
made an unannounced change to the setup they require you to have.  I
have experienced both of those situations, a bad authentication process
on the server more often than an unannounced change.


I have an account which occasionally complains when I'm trying to *read* mail, the next day it will be fine again. Not a big deal because nothing important comes in that way. To unannounced changes, look at the instructions for setting up Thunderbird on your mail-provider's website. They may not have mailed you about upcoming changes but they will have documented the requirements there - unless they are complete idiots (always a possibility). In my case I have 6 accounts with 5 mail providers and only one of the four who changed their authentication process told me in advance, they had all updated their documentation though. I believe they had offered the new variation for quite a while before they turned the old one off.

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