If you don’t have a strong subject line, then your emails would never be opened by your prospect, and he’ll never gets to see your offer. To create a strong subject line, follow these suggestions :

1 - Urgent - Create a sense of urgency by incorporating a time element or other - like, "make 100,000 working from home this year", much better then "make 100 working from home"

2 - Unique - it should say something new, or if something old, say it in a new way, like "Why Japanease women have beautiful skin"

3 - Ultra Specific- it teases the reader into reading further and ordering the produtct, it’s fascinating! "Bills it’s ok to pay late", "what never to eat in an airplane"

4 - Useful : offer a strong benefit that appeals to the reader self-interest, like "best time to file for a tax refund"

When you write a subject, note yourself for each of these four categories from 1 to 4. If it doesn’t rate a 3 or 4 in at least three of the four U, it can benefit from rewriting