For example, I don’t believe that your subject line should be less than 55 characters or more than 67 or whatever the studies say. At the end of the day, you can write a long ineffective subject line or you can write a short ineffective subject line. It’s not the number of characters you use that matter, but what you say and how you say it.
Here are the only 4 subject line rules I truly follow…read on
by Kristen Gregory on October 12, 2009
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I like it, it’s the straight talking that gets the trust.
One thing I have noticed about subject lines is a consistent convention can help people find your email more easily. So once you have found the one that works, keep it consistent for the frequent interactors. The people who rarely or never interact, mix it up a lot, what have you got to loose?