Can you use “magic words” to escape spam?

You've probably seen the advice somewhere: avoid words like "free", "highly likely", or "buy now" and your emails will skip the spam folder. It's one of the most common myths in email marketing. And unfortunately, it sends people down a rabbit hole of word-swapping that doesn't move the needle at all.

Modern spam filters don't work like a blocklist of forbidden phrases. They're machine-learning systems that weigh hundreds of signals at once. A word like "free" in a trusted sender's email barely registers. The same word from a domain with no sender reputation and zero authentication? That's a different story.

The signals that actually matter are things like:

• Sender reputation. Does your domain and IP have a track record of sending wanted mail?
• Authentication. Are SPF, DKIM, and DMARC set up correctly on your domain?
• Engagement. Are real people opening, clicking, and replying? Or are they ignoring and deleting?
• List health. Are you hitting spam traps, generating hard bounces, or sending to addresses that haven't engaged in years?
• Complaint rate. How often are recipients marking your mail as spam?
• Links and infrastructure. Are your URLs going to domains with bad reputations? Are you on shared IPs with senders who behave badly?

None of those are word choices. They're structural, behavioral, and relational signals. No magic phrase unlocks the inbox, and no forbidden word auto-routes you to spam in isolation.

The honest trade-off is this: time spent auditing your subject lines for "risky words" is time not spent on what actually works. Clean your list. Fix your authentication. Send to people who asked for your emails. Build a pattern of engagement. That's what filters respond to.

If you want to check what your domain looks like to filters right now, our free blocklist checker is a good starting point. Or if your placement suddenly dropped and you're not sure why, the SOS hotline is free and we'll actually help you diagnose it.