You may have written dozens of Emails and have barely think about the Subject line, if you do, you are making a mistake. The Subject line often determines whether an Email is open and how the recipient responds.
Here are some ideas that we should Follow.
Keep it short and sweet not above(50) words, use Familiar sender name, Avoid the no- reply sender name, segment your list (buyers, freebies) do not make false promises, do not tell much about what is in side, make people feel special, create a sence of importance, let your Question be compelling, split test your subject line (A/B
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