Disable envnoathost?

[Kris Kelley]

Is there a way to disable qmail-send's use of the envnoathost control file,
so that any message bound for an address without an @ sign is simply
refused?

I know I could put something like nonexistenttrashdomain.com in envnoathost
so that all such messages would get bounced back to the sender, but I'm
hoping for a cleaner solution, and hopefully one that doesn't involve code
hacking.

Thanks!

---Kris Kelley