I'm looking for a plugin to limit Contact seller

I have a problem with a user who sends email to everyone on the web page using "Contact seller" how to stop it?

@Marius
I would say it was part of some plugin or feature but cannot remember which one 

I will wait 
I know you can help me

@Marius
Maybe I just think about something different (some other limits)

yes I want to limit how many contacts you need per day or ... the second time he does something like that.
at Contact seller you can send unlimited emails

Ok problem here would be that contact form would be availabble for logged in only.
I think we were doing something like that as custom work.

I hope to stop my friend from spamming

Do not have these mods anymore, it required new table to evidence history of form usage and some code updates.
Maybe will do such plugin 

the same problem again
makes a user and gives email to everyone

thank you very much!