Example:
You may add a TXT Record for yourdomainname.com with the value as This is my email server. Here, if anybody was checking the TXT Records of yourdomainname.com, would notice the above text appearing in the TXT Record.
TXT Record can be used to implement the following:
- Sender Policy Framework (SPF): Sender Policy Framework is an extension to the Simple Mail Transfer Protocol (SMTP). SPF allows software to identify and reject forged addresses in the SMTP Mail From (Return-Path). SPF allows the owner of a domain to specify their mail sending policy, e.g. which mail servers they use to send mail from their domain name. The technology requires two sides to work in tandem:
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- The domain owner publishes this information in an TXT Record in the domain's DNS zone, and when someone else's email server receives a message claiming to come from that domain, then
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- the receiving server can check whether the message complies with the domain's stated policy. If, for example, the message comes from an unknown server, it can be considered a fake.
- DomainKeys: DomainKeys is an email authentication system (developed at Yahoo!) designed to verify the authenticity of the email sender and the message integrity (i.e., the message was not altered during transit). The DomainKeys specification has adopted aspects of Identified Internet Mail to create an enhanced protocol called DomainKeys Identified Mail (DKIM)
