**Solved**
jcteyssi...@gmail.com wrote:
Le vendredi 4 octobre 2019 11:18:53 UTC+2, Don Spam's Reckless Son a écrit :
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/

One of my mail account was suddenly telling the password was wrong last week.
After waiting some days to see if it will be corrected on provider's side 
(nothing change on my side; sometimes it occurs... and is corrected a pair of 
hour later)

I connect with web interface to my mail.... and i was warned to change my password: provider's 
security have changed (without notice! i blame them for this; they can change but will have to 
notice users BEFORE) and the password have to be longer, with letters, numbers, non 
alphanumeric characters (but strangely, a very few is allowed: > is, < is not :D).... my 
old one (since years... was "only" six letters.

Works perfectly now.
I found the problem. I called Comcast tech support and they were of no
help -- they thought something was wrong with my password. I found that my connection security was set to "none", so I set that to "SSL/TLS" and authentication method to "Normal Password" and it works. It's funny -- it worked the day before I posted this message -- I hope they didn't let me use these settings since I set up my PC (in 2011).
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