The backbone of digital marketing is SEO (Search Engine Optimization) and the essential part of SEO is Keyword Research. In other words, can say the keyword research process for SEO is necessary to start organic promotion.
We should authenticate MailChimp account before using it. This tool is very sensitive and they are very restricted about spamming and sending bulk emails using wrong methods. So you should authenticate your account first. For it, you need to verify your domain and use SFP and DKIM records in your cPanel.