1. Hi Tony – Yes, you can use “free” in an email subject line. Just don’t make free the first word or spell it in all caps. Now that filtering (by most major ISPs) has migrated away from content-based toward domain reputation AND the term is used in heavy rotation by retailers, it’s no longer an issue. People still respond to “free” so, the increase in actions will almost always outweigh the email messages lost from filtering.

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