Here's a great tip... if you want to see some great examples of subject lines, go check out your newspaper or even those hilarious gossip tabloid magazines. If you really want to go out there and write subject lines that really grab attention and get emails opened, then you have to start reading newspapers more diligently and study the headlines. Why would that be true? Those are high-pressure writing jobs, they were created by professional journalists and writers, plus they simply have to do a good job. Most likely they've written thousands of headlines over the years, and they understand how to hook someone into an article. They and you have the same objective in mind, and that is to get someone's attention and compel them to read something.
Headlines stir and speak to human emotions, and that is why so many newspaper, or media, headlines appeal to our emotions. It is the effect of the emotion that creates a desire to know more, and that is what you want to do with your email subject lines. So go out there and read as many newspapers and magazines as possible because once you get a hang of it, there's absolutely no looking back. Your email's subject line should be as honest as it can get. There should be no confusion as to what you're trying to convey.
When people read your subject line, you want them to feel comfortable that they know what to expect. Your subject line should be able to connect to the main content of your email so that the prospects don't feel that they've been misinformed. One good idea is to read other people's email subject lines, and you'll have a better idea of what to do and not do.
The best thing to do after writing any copy, including your subject line(s), is to walk away from it and then return to get a feel for it. One thing you can do is look at your subject lines from the view of how your readers may react to it. Do you feel like you just have to read it - right now? It's important to be honest, and if it doesn't stir any emotions in you, then there's a good chance it won't do that for your readers.
Don't forget that you can always test it by mailing it out to a smaller number of people. As always, your audience can tell you exactly what you need to know if you ask them in the right way. Just keep doing this and you can develop a sort of instinct for knowing what has a high likelihood of working.
All in all, e-mail marketing can be very complicated if you don't work at keeping the details organized. Your subject lines are a vital part of every campaign. Even when you are only sending out a quick newsletter it is important to spend time composing the best subject line that you can so that more people will want to open your mails.