Howto deactivate users under linux with samba and courier servers.
- deactivate samba sam account :
smbpasswd -d username
- delete objectClass CourierMailAccount in LDAP to prevent further mail delivery if desired. Or set disableimap,disablepop3, disablewebmail to 1 to only disable login
- set attribute shadowExpire to 1 in LDAP (meaning that account is disabled since 1 day after 1970-01-01). This also prevents ssh logins when using pam_ldap