Startups and established companies using the agile methodology have a mantra - "fail early, fail fast, fail often." I've been a big champion for failing fast over the years and I even won an "award" at a previous employer for failing during an innovation day.

Looking at statistics that are generated from your campaigns can help target messages and point out minor tweaks you can make to have a bigger engagement from your mailing list. Spending an hour or two a month to review how your campaigns are doing can make a difference to your bottom line and provide more targeted content to your mailing list.