I have been getting some really great comments about the FreeBSDrocks site in regards to qmail. Here are a few I just got recently:

Thanx a lot for a rock solid qmail installation. I really sleep well at night knowing that it will also run when I get up in the morning.

and here is another from a client of mine:

your box in our vmware cluster is basicly invicible and it runs better than anything i would have been able to put together
with the postini front end, we have nothing to worry about really

Thanks for the comments!