If you've ever heard George Carlin's famous "Seven Dirty Words" you can't say on TV, you can safely avoid using all seven in your subject lines. They will definitely get you blocked.
Here is a list of 100 more that you should avoid using as well:
Top 100 words NOT to use in your subject lines:
all words that relate to sex or pornography
all words that related to cures or medication
Jordan Ayan is the CEO of SubscriberMail (www.subscribermail.com), an email marketing services and technology provider.