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Best Practice for the length of email subject lines?

Question asked by 20287 on Feb 25, 2014
Latest reply on Feb 25, 2014 by 51227
I like positive directions in an email subject line like "Top 5 Reasons to Upgrade to XYZ" and "Take Advantage of the New XYZ".  But some of my colleague want to shorten to only 3 words b/c they are concerned that leads can't read the entire subject without opening the email.

While I don't want the subject line to be too long, I want it catchy.  So, what's too long?