The success of your email marketing campaign is assured only of your emails are being opened by the users. However, to ensure that the “open rate” of your emails improve, you must :-
1. Keep your subscriber email list fresh because at times people change their email addresses.
2. Avoid spam filters.
3. Send mails at the right time.
4. Write a unique subject line.
5. Ensure the tone of your email is casual and friendly
6. Write engaging content in your emails.
7. Ensure that your email content has humor in it.