As stated above, Email Marketing do not impact directly your SERP as Search engines can not access your Email. But a Targeted Email marketing Campaign can help in driving quality traffic to your blog/website. This will help in reducing Bounce rate and Increasing Customer interaction with more Time on Site. These factors will ultimately improves your SERP. Even Getting targeted Traffic will also increase your Business Sales in case of a E-Commerce Website. So, using a Email Marketing Company
for running your Email campaigns along with SEO is a Win Win Situation for your Business.