No snooping is going on at all. There is, as was stated earlier in this thread, a sitewide filter and the filter effects PMs also. (Hence "sitewide"). It is necessary to prevent the promotion of sites whose security we can not vouch for. Accounts are often created for the express purpose of sending out mass PMs with scam sites. We take every measure possible to help ensure no one is directed to a scam site from our forums and we will continue to practice this way.