Find way to send certificates automaticly, when stundents complete an activity

[bozoh]

Neither 'mod_certificate' nor 'mod_simplecertificate' have an option of sending a certificate via email automatically (by 'passing an exam', I assume you mean that the 'user completes some sort of activity in Moodle').

You can configure the certificate to be emailed to teachers (or a specific list of other users) at the point where it is viewed by a student (and you can set up the certificate to only be viewable when a certain criteria is met).

The only way to do what you want is for a developer to add the feature via code.

The quiz module can be configured to automatically sends email when the quiz is submitted (to the teacher and/or the student who submitted it) and to send an email when a quiz is overdue. The only way you can send the results via email is to manually export them and then email them yourself.

Again, this is a feature that could be added by a developer, but which cannot be done without code changes.

[bozoh]

May help
http://docs.moodle.org/dev/Events_API#Handling_an_event

[bozoh]

https://moodle.org/plugins/mod_accredible do this, see how and copy it