How to make the subject line content more attractive for recipient?
Personalizing the message is a good way to emphasize your message in the recipient’s Inbox. Also be attentive the “from” line lists your company, brand or newsletter name. That will catch your reader’s eye too. Also you can announce the offer right in the subject line. To keep recipient’s attention on your message make sure the offer’s key elements appear in the first 50 or 60 characters.
