Reverse DNS (rDNS) is a DNS lookup that maps an IP address to a domain name. It is used to verify that the sender of an email is who they claim to be and to help prevent spam. To check if reverse DNS is set up for your domain, you can use a variety of online tools, such as MX Toolbox or whatsmydns.net.
Setting up reverse DNS is important for several reasons. First, it helps to prevent spam by verifying that the sender of an email is who they claim to be. Second, it can help to improve your email deliverability by ensuring that your emails are not blocked by spam filters. Third, it can help to protect your reputation by preventing your domain from being associated with spam.
