Everyone keeps asking me:
“which spam words should I avoid?”
Wrong question.
Spam filters don’t panic because you wrote “free” or “guarantee.”
They react to patterns.
• Brand new domain blasting 500 emails
• Zero replies
• Heavy tracking pixels + 5 links
• No warm-up history
• Same template to 1,000 prospects
That’s what kills campaigns.
Inbox providers like Google and Microsoft don’t just scan vocabulary.
They track sender behavior.
Reputation > wording.
Engagement > optimization hacks.
Before rewriting your copy 10 times, ask:
→ Is my domain aged properly?
→ Am I sending gradually?
→ Am I optimizing for replies, not opens?
→ Am I tracking less, not more?
Cold email in 2026 isn’t about avoiding words.
It’s about earning trust.
Fix behavior first.
Deliverability follows.