Nathan covered this pretty well but I just thought I could add a little two cents extra:
If there is someone you need to correspond with, there are a number of options. Firstly, there is the safe secure method of using the site's own chat. I highly recommend this option, unless of course you require a more private form of communication.
Secondly, you can ask the other person(s) you wish to contact if they can be contacted off site, and, if yes, how. Their info, their terms, their time.
As a general rule of thumb however, unless given permission:
DO NOT EMAIL ANYONE UNPROMPTED - EVEN IF THEY PROVIDE THEIR EMAIL ADDRESS.