Hmm, should try harder before asking for help 🙂
Was quite simple in the end (right or wrong) it works:
$domain_array = array('googlemail.com','gmail.com');
$validemail = is_email($email_to_check);
$exists_text="";
if ($validemail):
$exists = email_exists($email_to_check);
list($user, $domain) = explode('@', $email_to_check);
if (!$exists):
if (strpos($user, '+')) {
list($username_email, $crap) = explode('+', $user);
$exists = email_exists($username_email . '@' . $domain);
$exists_text = __('User account exists with this email address', 'pw_texts');
$email_to_check = strtolower($username_email . '@' . $domain);// Gmail only recognizes lowercase
}
endif;
if ($exists):
carry on as before
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