SMTP SSO with Postfix, GSSAPI and Samba4 AD

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Hello,

I want to set up a Postfix SMTP server with cyrus-sasl in GSSAPI mode. I have two Samba4 servers in AD mode, and my clients are in windows 10.
I removed the execution of Posfix in chroot to simplify.
I added two keytab in /etc/krb5.keytab smtp/smtptest.domain.fr and host/smtptest.domain.fr
Currently I can authenticate with windows credentials from a windows client under Thunderbird with the "normal password" settings.
But if I try to switch from LOGIN to GSSAPI ( in /etc/postfix/sasl/smtpd.conf ) it doesn't work, here is the message in Thunderbird ( Sending of the message failed.
The Kerberos/GSSAPI ticket was not accepted by the Outgoing server (SMTP). Please check that you are logged in to the Kerberos/GSSAPI realm.)

Here are some settings :

klist -k -t /etc/krb5.keytab
Keytab name: FILE:/etc/krb5.keytab
KVNO Timestamp           Principal
---- ------------------- ------------------------------------------------------
   2 16/09/2021 16:00:44 host/smtptest.domain.fr@xxxxxxx
   2 16/09/2021 16:28:14 smtp/smtptest.domain.fr@xxxxxxx
   2 20/09/2021 09:19:41 smtpd/smtptest.domain.fr@xxxxxxx

/etc/default/saslauthd :
START=yes
DESC="SASL Auth. Daemon"
NAME="saslauthd"
MECHANISMS="kerberos5"
MECH_OPTIONS=""
THREADS=1
OPTIONS="-c -m /var/run/saslauthd"

root@smtptest:~# saslfinger -s
saslfinger - postfix Cyrus sasl configuration lun. 20 sept. 2021 09:53:49 CEST
version: 1.0.4
mode: server-side SMTP AUTH

-- basics --
Postfix: 3.5.6
System: Debian GNU/Linux 11 \n \l

-- smtpd is linked to --
        libsasl2.so.2 => /lib/x86_64-linux-gnu/libsasl2.so.2 (0x00007f87cfe08000)

-- active SMTP AUTH and TLS parameters for smtpd --
broken_sasl_auth_clients = yes
smtpd_sasl_auth_enable = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level = may

-- listing of /usr/lib/sasl2 --
total 16
drwxr-xr-x  2 root root 4096 14 sept. 14:31 .
drwxr-xr-x 54 root root 4096  3 sept. 09:46 ..
-rw-r--r--  1 root root    4 14 sept. 14:31 berkeley_db.active
-rw-r--r--  1 root root    4  7 févr.  2021 berkeley_db.txt

-- listing of /etc/postfix/sasl --
total 12
drwxr-xr-x 2 root root 4096 20 sept. 09:24 .
drwxr-xr-x 5 root root 4096 17 sept. 16:43 ..
-rw-r--r-- 1 root root  160 20 sept. 09:24 smtpd.conf

-- content of /etc/postfix/sasl/smtpd.conf --
pwcheck_method: saslauthd
mech_list: GSSAPI
keytab: /etc/krb5.keytab
log_level: 7

-- active services in /etc/postfix/master.cf --
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
submission inet n       -       n       -       -       smtpd -v
  -o syslog_name=postfix/submission
  -o smtpd_sasl_auth_enable=yes
pickup    unix  n       -       y       60      1       pickup
cleanup   unix  n       -       y       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       y       1000?   1       tlsmgr
rewrite   unix  -       -       y       -       -       trivial-rewrite
bounce    unix  -       -       y       -       0       bounce
defer     unix  -       -       y       -       0       bounce
trace     unix  -       -       y       -       0       bounce
verify    unix  -       -       y       -       1       verify
flush     unix  n       -       y       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       y       -       -       smtp
        -o syslog_name=postfix/$service_name
showq     unix  n       -       y       -       -       showq
error     unix  -       -       y       -       -       error
retry     unix  -       -       y       -       -       error
discard   unix  -       -       y       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       y       -       -       lmtp
anvil     unix  -       -       y       -       1       anvil
scache    unix  -       -       y       -       1       scache
postlog   unix-dgram n  -       n       -       1       postlogd
maildrop  unix  -       n       n       -       -       pipe
  flags=DRXhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix -       n       n       -       2       pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FRX user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}

-- mechanisms on localhost --

-- end of saslfinger output --

If anyone can help me....
Thanks in advance.
Samuel


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