Once you get your IP reputation above 90 on a regular basis, then the only two variables you need to be worry about is engagement and content. To improve your engagement there are seven simple things to test. Test plain text content only, test your footers including your unsubscribe link and surrounding text, test from e-mail address and reply to email address, test message content, send different messages to unengaged subscribers than you do to engaged subscribers, purge “dead” leads or send from a different IP address, and for new people coming into your list strongly encourage people to whitelist your from domain.
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Read the full article: Increasing Your Response Rates. Infographic provided by: EmailDelivered.com

Read the full article: “7 Steps to Warming Up a Cold List“