Hello I have installed "fast secure contact form" on a client's website. client says he is receiving spam messages through the form, and he is asking me if we can block it. so I wanted to find out if there is a good way of doing this. I can block their ip via htaccess, but they can easily change their ip I can block any messages containing links, but then a legit user won't be able to send links. what else can I do? am I missing anything?