Don't think so. Imagine regular user who would like to send a message to you, and got the
551 Message rejected by server
or whatsoever...
With this patch he (she) will get:
551 Your message is detected as spam
or
551 Your message contains Bagle-MM virus
or
551 Your message contains prohibited attachment 'program.pif'
Ok. This should be option to toaster.
-- Eero