Login plugin Hooks not running - modx

Question

I am trying to send a 2nd email to my sites admin when a user registers.
I made a postHook snippet that sends an email but it didnt work - the Registration process worked as expected, but I got no 2nd email from the hook.
In testing I set the hook from postHook to preHook and tried again - this time the form didnt process at all - no new user was created and no activation email was sent. It didnt even redirect to the submittedResourceId.
So, I deleted everything in my preHook Snippet, except the return true; and tried again - still nothing.
It appears Login wont run any Hooks at all. I have no idea why.
Would anyone be able to suggest any fixes?
My register snippet is:
[[!Register?
&submitVar=`registerbtn`
&activationResourceId=`19`
&activationEmailTpl=`lgnActivateEmailTpl`
&activationEmailSubject=`Thanks for Registering!`
&submittedResourceId=`23`
&usergroups=`2`
&validate=`nospam:blank,
username:required:minLength=^6^,
password:required:minLength=^6^,
password_confirm:password_confirm=^password^,
fullname:required,
email:required:email`
&preHooks=`adminEmailHook`
]]

Answer 1

I've done something similar before. There is my code:
[[!Register? &postHooks=`sendMessageToAdmin`
Snippet sendMessageToAdmin:
<?php
$message = 'Auto message:<br><br>A new user signed up: '.$hook->getValue('fullname') . ', using email address '.$hook->getValue('email').'.';
$modx->getService('mail', 'mail.modPHPMailer');
$modx->mail->set(modMail::MAIL_BODY,$message);
$modx->mail->set(modMail::MAIL_FROM,'info#domain.com');
$modx->mail->set(modMail::MAIL_FROM_NAME,'My website');
$modx->mail->set(modMail::MAIL_SENDER,'Auto message from my website');
$modx->mail->set(modMail::MAIL_SUBJECT,'Someone signed up');
$modx->mail->address('to','info#domain.com');
$modx->mail->setHTML(true);
if (!$modx->mail->send()) {
$modx->log(modX::LOG_LEVEL_ERROR,'sendMessageToAdmin: An error occurred while trying to send the email: '.$err);
}
$modx->mail->reset();
/* tell our snippet we're good and can continue */
return true;