Have a look at your mailbox. I am sure; there must be “N” numbers of unread emails with a plan of not reading them ever. This is because the email subject line didn’t entertain you much to proceed further.
It’s not just you; 47 % of email users open their emails based on the subject line itself. This is a huge loss to the email sender. The same nightmare comes to a salesperson when they send outreach emails to multiple recipients.
A sales email must have a powerful subject line that will engage the reader, create a curiosity in their mind, make them open and take action.