Be specific:
Keep your subject line short and sweet, no one wants to read a long paragraph in their inbox. Have your subject line concise so that people can quickly understand what the email is about.
If you’re announcing a sale, mention what’s on sale. If there’s new content, let people know what they can expect to find in your message. Avoid general statements like “Hey there!” or “Check out this!”
Be clear and direct, tell your readers exactly what you need from them. This will help reduce confusion and save time for both of you.
Call to Action:
Subject lines can make or break your click-through rates. In fact, according to one study, subject lines are responsible for about 27% of all opens. Successful email should have an obvious or implied strategy that drives the recipient to an action, i.e. opening and reading the email.
Consistent:
Use a consistent “From” address. Because of the dramatic increase in spam, recipients look at a combination of the from address and subject lines to determine whether the email delivered in their inbox is from a trusted source. As a result, the job of a subject line now, must not only entice someone to open an email, it must discourage the recipients from deleting it as an unwanted email. Therefore a consistent “From” address may get your message read.
Empathy:
While your emails may be distributed to thousands or millions of recipients, they are being received by individuals. Subject lines must recognize this and “speak” to the needs and interests of the recipients as individual customers, readers, or prospects.
Trust:
Subjects that over promise or mislead can ultimately destroy trust with the email receiver. For example, if an email campaign promises something that it cannot deliver, recipients may quickly lose faith in the sender’s ability to be truthful. Additionally, if an email is misleading about the content or purpose of the message, it can damage confidence between the sender and recipient.
Use personalization tokens:
Personalization tokens can be used in email subject lines to increase open rates. Studies have shown that personalized emails result in higher open rates and click-through rates than non-personalized emails.