self-destruction

[the/eXtreme]

Hey, I'm having a lot of fun with the hooks in mutt, but---

Is it possible that using hooks to generate different cyber-egos for
different recipients could inadvertently shut me out of a news group
that I was subscribed to?  Could I somehow have set things in .muttrc so
that a news group no longer recognizes my postings as coming from me?

(Why I'm asking: since I've switched to mutt, I've had several folks
tell me they are not getting my emails...).

TIA/x