i was using a greylisting approach which filtered a lot of spam, but was annoying for customers who had to wait an hour to receive an initial e-mail from a new

i was using a greylisting approach which filtered a lot of spam, but was annoying for customers who had to wait an hour to receive an initial e-mail from a new contact. i've since switched back to postini. i haven't seen any changes on way or the other since their google acquisition, but their filtering is very accurate and they offer a webmail-like interface for checking/forwarding spam and adjusting settings.