A reverse DNS lookup is a query that will retrieve the domain associated with a given IP address. It's simply the opposite of the well-known DNS lookup which gives IP addresses associated with a domain.
Reverse DNS lookup is commonly used by email servers to track down malicious messages and spam, as it can identify and verify the domain of an incoming email.
Reverse DNS lookup is a key element of the security protocol used by email servers to protect recipients from malicious emails. Not all sending servers are supporting Reverse DNS lookup, but those that don't are likely to be blocked by receiving servers. This can affect negatively your deliverability, and this is why you should check if your server supports such a protocol.
Everything you need to know about email deliverability to make sure that your emails reach the inbox and never land in spam. More than 30 emails key points analyzed, including practical guides and relevant tools to use to maximize your email deliverability and increase the ROI of your emailing campaigns.
Spam filters are using keyword detection to spot junk emails and make sure your inbox stays clean. This is why you should choose carefully the words used in the subject and body of your emails. Here's is the ultimate list of spam-trigger keyword that you should ban from your email content in 2021!