If you even begin typing in a search for spam terms to avoid in email subjects, it becomes immediately clear that email marketers spend a lot of time worrying about getting past spam filters and in front of their readers. But as Hubspot recently pointed out, there are really 2 sets of filters between you sending an email and your contacts reading your message.

The first is the complex filtering system used by email clients, which is sensitive to words, phrases, symbols, and styling (like all CAPS). The second barrier is your contacts’ own filter that determines whether or not they will open your message if it does reach their inbox.

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