How can I protect my deliverability?
To avoid landing in SPAM, first of all make sure that you're targeting the right audience and you send quality and personalized content to them - this way they will be less likely to mark your messages as SPAM and damage your domain reputation.
What is DNS?
DNS stands for “Domain Name Server” - the Internet's system for converting alphabetic names into numeric IP addresses. For example, when a Web address (URL) is typed into a browser, DNS servers return the IP address of the Web server associated with that name. When you type in “growbots.com” in your web browser, the browser doesn’t really know “where to go”, because servers’ “location” (address) aren’t actually names (like a domain) but rather IP addresses. Browser looks up the IP address behind “growbots.com” to know where it should go, and the “address book” that tells which domain points to which IP address is DNS.