While attempting a scratch thunderbird install client on my laptop, it returns a message " user_name""passwd" not found on server ( orange mail ) during accunt setup stage, despite of I can access with no problem my mailbox through login in. I did uninstall thunderbird, delete my default '.thunderbird' directory, reinstalled it and same result at same step. I checked with 'nslookup' for IMAP and SMTP Orange servers, they do answer pretty well Can anyone explain where i did the mistake ? I must add, LM was upgraded from LM18 to LM20 and so on, I previously had a working thunderbird client may be lost during various migrations ? Please don't ask me with which LM version it was, sorry. '''Thunderbird 1:115.18.0+build1-0ubuntu0.22.04.1''' from Synaptic + Linux Mint 21.3 All ideas welcome.