Conventional wisdom says that personalizing email subject lines in email marketing and other commercial email, such as putting someone's first name in the subject line by using tags or other automations, increases the open rate for that email marketing. n fact, if you do a web search, such as in Google, for "email personalization open rates", you will find over 16million results, most of which tell you that personalizing email subject lines in your email marketing will boost your open rate. That may have been true some years ago, but not necessarily so much now.