Many thanks ,it was as you expected , the authdaemond wasn't running, now that I have got it running . It still is creating trouble... and now there is a socket in the /var/spool/authdaemon.

But still the authdaemond with DEBUG_LOGIN=2 returns this :

# echo foo | /usr/sbin/sendmail -f "" post...@example.com && tail -f /var/log/maillog Oct 4 15:08:43 mail postfix/pickup[3338]: 5D1072B0053: uid=0 from=<> Oct 4 15:08:43 mail postfix/cleanup[3548]: 5D1072B0053: message-id=<2005...@mail.example.com> Oct 4 15:08:43 mail postfix/qmgr[2046]: 5D1072B0053: from=<>, size=281, nrcpt=1 (queue active) Oct 4 15:08:43 mail authdaemond: received userid lookup request: ba...@example.com Oct 4 15:08:43 mail authdaemond: authuserdb: trying this module Oct 4 15:08:43 mail authdaemond: userdb: unable to stat /etc/authlib/userdb.dat: No such file or directory Oct 4 15:08:43 mail authdaemond: userdb: looking up 'ba...@example.com' Oct 4 15:08:43 mail authdaemond: authuserdb: REJECT - try next module Oct 4 15:08:43 mail authdaemond: authpam: trying this module Oct 4 15:08:43 mail authdaemond: authpam: username 'ba...@example.com' not found in password file Oct 4 15:08:43 mail authdaemond: authpam: REJECT - try next module Oct 4 15:08:43 mail authdaemond: authldap: trying this module Oct 4 15:08:43 mail authdaemond: selected ldap protocol version 3 Oct 4 15:08:43 mail authdaemond: binding to LDAP server as DN '<null>', password '<null>' Oct 4 15:08:43 mail authdaemond: using search filter: (mail=ba...@example.com) Oct 4 15:08:43 mail authdaemond: ldap_search_st() failed Oct 4 15:08:43 mail authdaemond: authldap: TEMPFAIL - no more modules will be tried Oct 4 15:08:43 mail postfix/pipe[3552]: 5D1072B0053: to=<ba...@example.com>, orig_to=<post...@example.com>, relay=maildrop, delay=0, status=deferred (temporary failure. Command output: /usr/local/bin/maildrop: Temporary authentication failure. )

Whereas the LDAP search is pretty fine:

# ldapsearch -x -LLL -b "uid=bammbamm,ou=it,ou=people,dc=example,dc=com" "(objectclass=*)" dn: uid=bammbamm,ou=it,ou=people,dc=example,dc=com uid: bammbamm givenName: Bamm sn: Bamm cn: Bamm Bamm userPassword:: YmFtbV9zZWNyZXQ= homeDirectory: /var/spool/mail/bammbamm mail: ba...@example.com maildrop: post...@example.com maildrop: bamm...@example.com maildrop: abu...@example.com objectClass: CourierMailAlias objectClass: CourierMailAccount objectClass: inetOrgPerson uidNumber: 1003 gidNumber: 1003 mailbox: /var/spool/mail/bammbamm/Maildir quota: 5120000S