I have my PM's blocked for personal reasons...besides, I can say more in an email.

I always try to respond to all emails with the exception of jokes. I have two neighbours that email me at least 10 times a day with "aging" jokes and such and I only respond every once in a while saying "Thanks for the jokes."

If the email is a personal one from a Pet Talker or other good friends, I always respond even though it may take me a couple of days...

I also accept email at my work address.....it's fun and makes me smile in the middle of a very busy workday.