1.Time it right. 在合适的时间发送。
Sending an emailat the right time with the right subject line can make a huge difference inopen and click rate.
合适的发送时间配上合适的主题会大大提高邮件的打开率和点击率。
2.Create a senseof urgency. 创造紧迫感。
Subject lines thatcreate a sense of urgency can give a 22% higher open rate. Using deadlines like“todayonly” or “24-hour giveaway”will encourage your reader to act now instead of putting it off until later.
造成紧迫感的邮件主题打开率能提高22%。用一些表示最后期限的词，例如“today only”或“24-hour giveaway”。
3.Use numbers.使用数字。
A lot ofbusinesses send emails with vague statements in their subject lines -- which iswhy using data and numbers is a great way to get your emails noticed. Aspecific discount，or the numerical benefit of a particularresource you're providing -- like "Join more than 750 others at this event！"
许多企业在发邮件时用一些意义不明确的主题，这就是为什么有数字和具体数据的字眼会在一堆邮件中被注意到。就像博客标题一样，在主题行中使用数字是一个提高邮件打开率的有效方法。写上一个特别的折扣、优惠或是特别的资源，比如这句“Join more than 750 others at this event!”
4.Make peoplefeel special. A few ideas for phrasing include:
让人感觉这封邮件很特别，一些例子如下，
"For ourbeloved customers only"
"An exclusiveoffer for you"
"My gift toyou"
"You'reinvited!"
"Privateinvite"
5.重要的关键词放在首位。
40% of emails areopened on mobile first–where the average mobile screen can only fit4-7 words max.
40％的电子邮件首先在移动设备上打开，而移动设备屏幕最多一行只能容纳4-7个词。
6.Using the words“Sale”“New”or “Video” in subject lines boost open rates.
在主题行中使用“Sale”、“New”或“Video”这些词可以提高打开率。
7.Emails with“Free”inthe subject line were opened 10% more than those without.
主题包含“Free”的电子邮件比没有包含的电子邮件打开率高10％。
8.Emails with"Tomorrow" in the subject line were opened 10% more than thosewithout.
主题包含“Tomorrow”的电子邮件比没有包含的电子邮件打开率高10％。
9.The top fivesubject lines in a recent study all included“Re:”.
最近一项研究显示打开率在前五名的主题都包括“Re：”。
10.A/B test yoursubject lines.对你的邮件主题进行AB测试。
Although thesetips and best practices are a great place to start，whatworks best for some companies may not work as well for others. It's all aboutfiguring out what works best for your specific audience. That's where A/Btesting comes in.
虽然这些小建议和他人实践的结果可以让你很好的开始EDM营销，但对某些公司来说合适的方法可能对其他公司来说并不合适。我们必须通过实践找出最适合你的客户群的有效方法，这就是需要进行AB测试的原因。
While it can betempting to use your intuition to predict what subject line language will makepeople click on your emails，you should constantly be A/B testing yoursubject lines and tweaking wording according to your results. What works bestfor your audience: Long or short subject lines？Including numbers or not including numbers？Questionsor statements？Good luck！
我们喜欢用直觉来推测什么样的语句会让客户打开你的邮件，但其实还是需要通过AB测试的结果来修改你邮件主题的措辞。什么样的邮件主题对你的客户来说最有效？是长句还是短句，包含数字还是不包含，疑问句还是陈述句。这些都需要你的实践，祝你好运。
整理自以下两篇文章：
https://blog.hubspot.com/marketing/improve-your-email-subject-line
https://blog.hubspot.com/sales/subject-line-stats-open-rates-slideshare
