8-Factor Score · Spam Check · Open Rate Tips
| Factor | Guideline |
|---|---|
| Length | 41-50 characters (6-10 words) is the sweet spot |
| Mobile preview | First 30 chars must hook — most inbox cutoff |
| Personalization | Using first name increases open rate 20%+ |
| Urgency | "Today only," "Last chance" (but don't overuse) |
| Curiosity gap | Create intrigue without being clickbait |
| Numbers | "5 ways to..." outperforms vague subjects |
| Emoji | 1 emoji can boost opens 5-10% (test it) |
| Avoid ALL CAPS | Triggers spam filters + looks aggressive |
| Category | Words to Avoid |
|---|---|
| Money | FREE, $$$, cash, earn, income, million, winner |
| Urgency (spammy) | ACT NOW, limited time, don't miss, expires |
| Hype | Amazing, incredible, guaranteed, no obligation |
| Shady | Click here, congratulations, dear friend |
Using 1-2 isn't fatal, but stacking multiple spam words drops deliverability significantly.
| Formula | Example |
|---|---|
| How to [achieve X] | How to double your email open rates |
| [Number] ways to [Y] | 7 ways to save on your next trip |
| Don't [do X] until [Y] | Don't buy a laptop until you read this |
| [Name], [personalized] | Sarah, your cart is waiting |
| Question format | Are you making these 3 resume mistakes? |
| Curiosity gap | The one thing top performers never do |