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User is adding a new email. Call to civicrm_pre detects a problem that requires that the update not happen. It hasn't actually happened by the time civicrm_post or post_save_civicrm_email is called. The update actually happens after post_save is called.

How do I abort the update?

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While I suppose you could empty the $params array, it would be a bit clumsy. Meanwhile you'll need a way to notify the user in context, so something form-specific would be helpful.

Instead of using hook_civicrm_pre, you might consider using hook_civicrm_validateForm(). You'd be able to run the same checks, but in case the value is no good, you could send the user back to fix it.

  • I tried adding hook_civicrm_validateFom, but it never gets called. Is there something I must do to make sure it does get called? – Bob Jones Dec 6 '15 at 19:32
  • Not sure where the problem is happening, but it should be getting called on any form you use. Try setting an error on a field you know is there by doing something like $errors['first_name'] = 'DEBUG TEST'; – Andrew Hunt Dec 7 '15 at 5:29

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