hi Jerome do you have idea how
customize elgg style and integration of smtp and using ldap
For customizing the Elgg style
you can use the basic theme settings on /admin/theme or if you need more a custom plugin needs to be developed.
SMTP integration
You can set the smtp settings in /elgg-config/settings.php
Using LDAP
I take it you wish to use that for authentication. You need a custom plugin for that. I don't remember if there are plugins available, but search is your friend.
If your authentication platform supports SAML you can use https://github.com/ColdTrick/saml_sso
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