No notification after change of domain

Julio,
Your English is fine!

As for your issue, is it just the email notifications about a new Like or Comment that aren't working? Everything else with JFBConnect seems fine?

If so, please check the following:
* The emails in the Social -> Notifications area are correct. At first, try to use only one email address to make sure it works there first.
* Try changing the "Mailer" setting in the Global Configuration area of Joomla to "PHP Mailer". We've heard of problems with the SMTP mailer in the past, but were never able to determine the cause. If you change this setting, make sure all other emails (registration, etc) still work properly.

If none of that helps, please post (or Private Message) a URL to a page with a Like button or Comment box that we can test with.

Thanks,
Alex