Only use wp_remote_post()
if you are actually posting something.
Try using wp_remote_get()
with a full url
$url="http://blabla.org/mailinglist/add?" . $user_email;
$results = wp_remote_get( $url );
// var_dump( $results );
Only use wp_remote_post()
if you are actually posting something.
Try using wp_remote_get()
with a full url
$url="http://blabla.org/mailinglist/add?" . $user_email;
$results = wp_remote_get( $url );
// var_dump( $results );