Does ptr start mail

A question about email protocols!

PTR stands for Pointer Record, which is a type of DNS record used in email protocols. It's also known as a "reverse DNS" record.

A PTR record is used to map an IP address to a domain name. In the context of email, a PTR record is used to verify the authenticity of an email sender by checking the IP address of the sending mail server against a domain name.

When an email is sent, the receiving mail server checks the IP address of the sending mail server against a PTR record to ensure that the IP address is associated with a valid domain name. This helps to prevent spam and phishing emails by verifying that the email is coming from a legitimate source.

In other words, a PTR record does not "start" mail, but rather helps to authenticate the sender of an email by verifying the IP address of the sending mail server.

Here's an example of how a PTR record works:

• An email is sent from a mail server with the IP address 192.0.2.1.
• The receiving mail server checks the IP address 192.0.2.1 against a PTR record to see if it's associated with a valid domain name, such as example.com.
• If the PTR record exists and matches the domain name example.com, the receiving mail server can verify that the email is coming from a legitimate source and proceed to deliver the email.

I hope that helps clarify things!