I'm set up in such a way that I don't really care.
Just as I've set my hard line as a ghost phone -- two silent rings and zero message capability -- because only my known contacts have my mobile number, I've set up e-mail addresses to handle all new incoming messages. I'll ultimately shift those who become new associates -- a more accurate word than clients -- to an address I closely monitor.
If I ever want to see what's behind a squeeze page, I use the ghost. I expect the same to happen to me as well, incidentally. If an opportunity turns out to have potential, I'll float through the filters, just as someone would do with me.
This allows me to be much more efficient in administering my correspondence.