If a user registers for an event the registration confirmation email does not get sent. The registration completes, however they see this error message:
I am using mail() and when I test Outbound Mail settings, it works.
Now the BUT… part: If I register a participant using the Register Event Participant option in the backend, the registration completes and the registration confirmation email is sent to the user.
I am stumped.
Were running CiviCRM 4.6.8 on Wordpress 4.3.1