Most email marketing forgets about these underused CTA types.
Basic/ Summarized...
1) Include text CTAs.
2) Add CTAs to signatures.
3) Link your images to landing pages or blog posts.
4) Make it easy to email or forward your message.
5) Include social sharing buttons.
6) Optimize your preview text.
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Especially #6 given the advent of mobile. Ensure that it is a linked preview.