How do I write a win-back email subject line?
Be warm and direct: say you have missed them and give a reason to come back, such as a new product or an offer. Avoid guilt or pressure, which can raise unsubscribes and complaints.
People who have gone quiet respond to relevance more than to drama. Reference something real, like what is new since they last bought, rather than a generic plea.
Test a plain subject against a benefit-led one and keep the winner. If a series gets no response, suppress those contacts instead of continuing to send.
In practice.
A store tests "It has been a while, here is what is new" against a subject that mentions a returning favourite product. It reviews clicks and orders from the lapsed customers and keeps the better one.
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