It used to be that marketers were set on building the largest email list possible, and many companies continue to boast about their “thousands” of subscribers. In order to stay competitive, marketers have tried tons of tactics to grow their lists, from pop-ups, to coaxing emails from lead gen assets, to running contests on social media that require an email address to sign up.
If that’s not enough to convince you to toss interstitials in the bin and never look back, there’s also the fact that users report these interactions as among their most-hated advertising practices (defined as ‘modals’ in this study by the Nielsen Norman Group). On a one to seven scale, modals (interstitials) landed at 5.82 for desktop users and 5.89 for mobile users, beating even autoplaying videos without skip for most-dreaded advertising type.
Also important for the growth of your business is that you’re always adding new customers. That’s what’s going to grow your revenues and make your business profitable. You can never stop generating new leads, because old leads will fall off the list or start ignoring your emails… and many will never buy. So it’s key to not let your list stagnate: Keep it fresh with an infusion of new names, all of whom are potential buyers.

Your best bet will be to give away something that’s valuable to your target market; for instance, a high-value digital asset on a niche topic. You can give away products (we’ve all seen contests where the prize is a free iPad or gift certificates), however this strategy often leads to entrants who are more interested in the money than in what you have to offer.
For effective and actionable results, you should do A/B tests, which test two (or more) different approaches. For example, you could send half of your list one subject line, and an alternate subject line to the other half. You could also A/B test the two approaches with a small subset of your list, then send the winning headline to the rest of the list.
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