When you want to create a win-back campaign: Develop a series of win-back emails to encourage inactive subscribers to re-engage, and utilize post-sending actions to automatically perform a specific list action on subscribers after they receive the final email in the series. This could be used to update one of their merge fields, move those subscribers to a different interest group, or to remove them from your list completely.
For example, I can safely share that I listen to a lot of music, and I’m almost fanatic about sound quality. I might listen to an album with poor sound quality once, but I probably won’t go back to it. And to be clear, 95%+ of new recorded music has what I consider poor sound quality (due to an absurd standard of perceived loudness, which takes away natural dynamic range from the sound). That said, I’m not a hi-fidelity sound geek. I’m perfectly happy with my high-end studio monitors—I don’t buy $1,000 power cables, $5,000 CD-players, or $20,000 loudspeakers capable of playing back sounds too high for dogs to hear.
This kind of initial research and analysis is incredibly important. If you include anything which you haven’t subjected to research, analysis, insights, experience, and expert opinion, it simply won’t fly. This is important. Everything these days has to be tailored very specifically to your brand and your personal customer experience. Your competitor might have an amazingly successful marketing strategy (and it's good to learn things from what they're doing!), but that doesn’t mean that the same kind of thing would be as successful for your brand.
When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.