I use postini, as a spam filter.
it's great. the university mandates it.
there are a few problems with it, but in general it has cut down the number of emails i get significantly. great.
the problem comes in the false negatives. i have to actually go
through the list of 100-150 emails per day to fish out approximately 1%
of emails that should be delivered. still, i think it's a good
software.
the BIG problem comes from when we want to approve senders of the 1%
legitimate emails. there is a LIMIT ON THE NUMBER OF CHARACTERS
on the "approved senders" list. yes, a limit. in this day
and age. a software owned by google. a limit.
the HUGE PROBLEM comes from the size of the approved list: 4KB.
4KB? really. four kilobytes. i can't even imagine
that 4KB is something that is measurable in the day and age of Big
Data, Terabyte drives for under $100, and 10GB free email accounts.
four kilo bytes.
shame on you, postini...