If you email me a pitch, include your phone number in the message.
If you don’t want to put a phone number on your email, put it on your Web site.
If you don’t put a phone number on your Web site or your email, I guess you don’t want to talk to the press.
If you don’t want to talk to the press, what are you doing in the PR business?
See also: Tip #2, Followup immediately
I’ve noticed this kind of things, and never really understood that. It’s like you said, if you don’t want to talk to the press, why working as a PR person? Find some other job where no one will bother you…