Moodle 2.2.5+ (Build: 20120920)
We are experiencing intermittent issues when setting up email notifications for self-registered users ( Email-based self-registration).
we do not have any SMTP set up, we use the Moodle internal email engine.
when the user fills up the form to self register and submit it, the following error is displayed to her/him:
Tried to send you an email but failed!
Moodle should send the user an email to validate the just-created account but it cannot send it.
Initially we thought it was due to some issues with the host provider, but then we established it is not in fact a simple PHP script works just fine.
Playing with Moodle settings both inour DEV and Production site we managed to get it working and we thought the issue was that the reply email address had to be assigned to the same domain as the moodle installation.
However more tests did not confirm and we are now pretty stuck with this, we do not know exactly how to proceed to investigate it further.
Could anybody suggest any troubleshooting step (for instance what about the email debugging? etc)
Thanks in advance