The reverse DNS record is also known as the PTR record, pointer record or IP resolver. A PTR is a reverse record for an IP address which allows an IP to map to a domain and vice versa. That means you can make temok.com point to 10.0.0.1 and make a PTR record so that 10.0.0.1, if checked, would tell you that it belongs to temok.com. It lets the receiver of your emails check for possible spoof emails which will be treated as spam. Without this record, the receiver must rely on guessing if your email might be spam.
Generally, when you have a PTR record, your emails have a better chance to deliver to the recipient's inbox instead of the spam folder.
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