Latest dovecot does not work with latest MUA (thunderbird)

[gmail]

Stuart Henderson kirjoitti 14.3.2021 klo 23.38:
> On 2021-03-14, lja at koti <lja at lja.fi> wrote:
>> # 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf
> That's nowhere near the latest Dovecot.
>
>
Updated dovecot to bleeding edge, and still got same issue.

# 2.4.devel (b0f498b69): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 5.9.0-rc5 x86_64 Ubuntu 20.04.2 LTS
# Hostname: superman.sillywalk.org
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = plain
debug_log_path = /var/log/dovecot-debug.log
info_log_path = /var/log/dovecot-info.log
log_path = /var/log/dovecot.log
mail_debug = yes
mail_location = maildir:~/Maildir/
mbox_write_locks = fcntl
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix =
}
passdb {
   driver = pam
}
protocols = imap pop3
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = mail
     mode = 0660
     user = postfix
   }
}
ssl_cert = </etc/letsencrypt/live/maindomain.fi/fullchain.pem
ssl_key = # hidden, use -P to show it
userdb {
   driver = passwd
}
protocol imap {
   imap_metadata = yes
}
local_name businessdomain.fi {
   ssl_cert = </etc/letsencrypt/live/businessdomain.fi/fullchain.pem
   ssl_key = # hidden, use -P to show it
}
local_name businessdomain.com {
   ssl_cert = </etc/letsencrypt/live/businessdomain.com/fullchain.pem
   ssl_key = # hidden, use -P to show it
}
local_name maindomain.fi {
   ssl_cert = </etc/letsencrypt/live/maindomain.fi/fullchain.pem
   ssl_key = # hidden, use -P to show it
}