Spam filters notice when five hundred messages leave the same domain with byte-identical bodies. So do recipients who are cc'd by a colleague.
Sequence steps now support spintax. Write alternatives inline:
{Hi|Hey} ${first_name} — {quick question|one question} about ${company_name}.
Each generated message picks a variant at random, so your send looks like correspondence rather than a broadcast. It works anywhere in the subject or body, and nests, so you can vary a phrase inside an already-varied sentence.
Use it on the structural parts — greetings, transitions, sign-offs — where variation costs nothing. The argument itself should still be one thing you believe.