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The most effective subject lines are those that are straightforward and predispose openers to click through and convert. However, creativity does have its place.

Whether you’re projecting your brand’s attitude, promoting a non-sales message or engaging in some newsjacking, creativity in less than half the length of a tweet can give your emails an advantage—especially when your subject line is backed up with great email content.

To get your creative juices flowing, here are our picks for 100 of the most inspiring subject lines from the past eight years, along with some notable trends and events through the years that have affected subject lines.

100 Inspiring Email Subject Lines from ExactTarget
 
This post originally appeared on the ExactTarget Blog.