Do email filters look at every word in the body?

Partially true. Filters do read your email body, but not the way you might picture it. There's no checklist of forbidden words sitting inside a spam filter. Modern filters use machine learning to score the whole message at once, looking at patterns, structure, and overall context rather than flagging individual words.

So writing "FREE" in all caps won't automatically sink you. But if your email is packed with urgent sales language, has a sketchy-looking link, comes from a domain with no authentication, and your last three campaigns got ignored by 80% of your list, that combination will absolutely hurt you. The filter is building a picture, not running a word count.

What actually moves the needle more than word choice? A few things worth knowing:

• Your sender reputation carries enormous weight. A trusted sender can write promotionally and land in the inbox. A new or cold domain sending the same message faces much more scrutiny.
• Engagement history matters a lot. If people open, click, and reply to your emails, filters learn you're worth delivering. If people ignore or delete without opening, that's a signal too.
• Authentication (SPF, DKIM, DMARC) tells filters you're a legitimate sender. Without it, content analysis becomes even more suspicious.
• Link quality is scanned closely. A broken redirect or a domain with a bad reputation inside your email can trigger filters even if your writing is perfectly clean.

The practical takeaway: stop editing your emails like you're trying to outsmart a word-scanner. Write clearly, send to people who actually want your emails, keep your list clean, and make sure your authentication is in order. That combination will serve you far better than swapping "free" for "complimentary."

If you want to see how your setup looks right now, our free Email Header Analyzer can tell you what filters are seeing about your authentication. Or if you're genuinely stuck, the SOS hotline is free.