Aweber对1000多封邮件主题行的研究发现，82%的高手发送的主题行都在60个字母以内。根据Backlinko的Brian Dean的说法，更短的主题行能获得更多的打开，因为较短主题行到达收件箱的频率更高更有神秘感。
Aweber's research on the subject lines of more than 1000 emails found that 82% of experts sent subject lines with less than 60 letters. According to Brian Dean of backlinko, shorter subject lines can get more open, because shorter subject lines reach the inbox more frequently and more mysterious.
如果你没有收件人的名字，你也可以实现个性化，因为你仍然可以使用收件人熟悉的名字/事物/共同点，比如[Inknowyouthroughxxx]，[asauserofxxxxcompany]，[heardaboutyoutthroughxxx]。