SPFEintrags

SPFEintrags, also known as "SPF records" or "Sender Policy Framework entries," are a type of DNS record used to combat email spoofing. SPF records are published in the DNS of a domain and specify which mail servers are permitted to send email on behalf of that domain. This helps receiving mail servers to verify that incoming emails are indeed from a legitimate source.

An SPF record is a text string that contains a list of IP addresses or domain names of authorized mail servers. When a mail server receives an email, it checks the SPF record of the sender's domain to see if the sending server is authorized. If the sending server is not listed, the email may be marked as spam or rejected.

SPF records are part of a broader set of email authentication mechanisms, including DomainKeys Identified Mail (DKIM) and Domain-based Message Authentication, Reporting, and Conformance (DMARC). Together, these technologies help ensure the authenticity and integrity of email communications.

To create an SPF record, a domain administrator must define the record in the domain's DNS settings. The record typically includes a version number, a qualifier (such as "+" for allow or "-" for deny), and the IP addresses or domain names of authorized mail servers. For example, an SPF record might look like this:

v=spf1 ip4:192.0.2.0/24 include:example.com -all

This record specifies that emails can be sent from the IP range 192.0.2.0/24 and from any server in the example.com domain, but no other servers are allowed.

SPF records are an essential tool for email security, helping to reduce the risk of email spoofing and phishing attacks. However, they should be used in conjunction with other email authentication mechanisms for maximum effectiveness.