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Re: Mail-Server response: A000002 NO Authentication failed

Further comment of mine (analysis) to narrow down the problem:
1. All emails are fetched from my mailserver (at my service-provider aon.at)
2. Difference of  IMAP-Server settings:
   within Kmail  it is:  securemail.a1.net
   within Thunderbird it is:  smail.a1.net
   o.k.--> Thunderbird does NOT produce the error  "Mail-Server response:   
   A000002 NO  Authentication failed
3. So therefore I changed Kmail IMAP-Server to:  smail.a1.net
   Result:  Until NOW  the error message does NOT appear
   Oh wait - just when typing this mail  I get the error-message TOO although  
   'smail.a1.net' is active

Interesting:  Official documentation of my service-provider for implementing 
email-account  does NOT indicate 'smail.a1.net" (!!)

Now I try as imap-server:  imap.a1.net with port: 143  (out of official doc of 

Am Sonntag, 6. März 2022, 13:54:37 CET schrieb Herbert Schwarzer:
> Additional comment:
> Now I have installed MATE-Desktop in Debian 11  a n d  configured
> <thunderbird> as mail-client alternative solution -> no such message.
> (all messages are fetched from my mail-server / as with Kmail too :) ).
> Herbert
> Am Sonntag, 6. März 2022, 11:16:42 CET schrieb Herbert Schwarzer:
> > Dear Debian-community,
> > 
> > irregularly an x-window pops up with message:
> > /The server (my e-mail-server at my standard internet-provider) rejected
> > the user-name and the password. Login failed. Server response is: A000002
> > NO Authentication failed./ BUT nevertheless  my mail-client (Kmail)  d o
> > e s receive every message. Serveral attempts by myside to locate the
> > error - believed that problems in Debian 11 with kontact/kmail/akonadi/
> > could be the reason.
> > Anyway distribution-tests in my VM (Debian testing / Debian oldstable /
> > Manjaro) lead to the same message.
> > So can I find the reason within my Debian 11 bullseye   o r   is this is a
> > special behaviour within the mailserver at my provider ( A1.net in
> > Austria)
> > This only appears within Linux - my (dual-boot) Windows 10  or my
> > smartphone-app runs without such message !
> > 
> > Any help / tips appreciated.
> > Greetings Herbert

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