I didn't see it mentioned, but I believe that QMailToaster deserves an
honerable mention.
It's incredibly easy to set up, you have one login (rather than a login
for each user), and it's very well documented.
The listserv support is excellent.
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I second the recommendation of Postini. I set it up last year for a
multi-national that I used to work for and couldn't have asked for a
better solution. There were a few false-positives tossed into the
quarantine (mostly "special offers" from retailers and quasi-spam
"business consultant" ne
