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It's worth telling people ahead of time that you are changing emails so they can whitelist you.
As for sending from a rep or not, it just depends on the audience. I usually prefer not to send generic stuff via reps and use the generic boxes like "firstname.lastname@example.org" as long as you can monitor replies.
The problem with sending from rep's real email names is they can get dumped into spam more and their real emails are never seen. To thwart that, I suggest using their middle initial as an email alias (with IT's help) for marketing sent emails.