Really enjoyed that read. I'm looking at implementing some simple spam detection for personal messages that are sent between users of my application. (They are

Really enjoyed that read. I'm looking at implementing some simple spam detection for personal messages that are sent between users of my application. (They are enquiries for sales and users are billed per enquiry so it's important to make sure that they don't get billed for spam), do you think Akismet would be suitable for this kind of thing? Any alternatives that you could recommend, I will probably get around to building my own at some point, but as a proof of concept I'd like to just get something running.