I setup SMTP configration and test them , also receive SMTP Server Configuration Verification Successful. mail that means my configuration is correct and working. When i enter any email address which is not registered in Ldap it will send mail to that address having text like someone try to reset password but this address is not in database etc , that is fine . But i entered any email address which is registered in LDAP it will not send any mail show exception in oxtrust logs . Exception is : -[org.xdi.service.MailService] (MailService.java:105) - Failed to send message javax.mail.AuthenticationFailedException: 535 Authentication failed: Bad username / password if my sendgrid crendentials are not correct than it will send mail to non registered users