The subject line tells readers what an email is about. In the inbox they usually see it alongside the sender and, depending on their email client, preview text. A clear subject helps them understand the message before opening it.
What makes a subject line clear?
Put the most important information first. How much of the subject remains visible depends on the device, email client, and inbox view. Check it in a real inbox, including on a phone. A word like “free” can accurately describe a genuinely free offer. One word alone does not tell you how a spam filter will classify the email.
Two subjects for the same newsletter
“Important news for you” leaves readers guessing. “Newsletter planning workshop on May 18” names the topic and date. If you compare two variants, choose your metric first. A recorded open alone does not establish that someone read the email.
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