Here's some examples of mailing lists that have lots of numbers (and letters) in the MAILFROM. You may find that you'll have to put in a counterweight everytime a user reports that they're missing mail when they sign up for a newsletter.
Andrew 8) p.s. I've deliberately munged the addresses a little to make sure that our actual recpients won't get their newsletter interfered with because it was posted to a public forum.
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