Txt record spf

Here is an off-the-reel axiom: one SPF record for one domain. This is explicitly defined in RFC :. The following is an example:. You forget that you already have a functioning record for Gmail and create a new one. In the end, you have two SPF entries as follows:. The best way to validate an SPF record for your domain is to use a dedicated tool. Just enter your domain name or IP Address and click the button. SPF Record Lookup emphasizes lookups for a particular domain. The validation outcome is the SPF Lookup Tree that you can expand to find main and additional lookups, like the following:.

Agari offers a bare-bones tool for SPF record verification. You can also check the record manually using nslookup. For example:. Malicious actors sometimes fake the from and reply addresses in the emails to disguise them as coming from a reputable source. A proper SPF policy helps organizations in fighting such malicious practices. The SPF domain contains a list of the IP addresses or hostnames authorized to send emails from a given domain name. Once a user places the SPF text record entry in their DNS zone, they do not need to reconfigure it for taking advantage of the servers, which include SPF checking as an integral part of their spam prevention systems.

Some email recipients have a strict requirement for an SPF framework. Thus, if a user sets up the SPF record properly, they can enhance their email deliverability and protect their domain against spam , which malicious actors send on their behalf.

There are a variety of places that organizations use to send emails. Make a list of all the mail servers, including the following which may be used for sending emails on your behalf:. Organizations usually own many domains. While they use some for sending emails, some remain dormant. So, do they need to protect all their domains with SPF? The answer is yes. Suppose the organization chooses to create an SPF record for only their sending domains.

In that case, the non-sending domains will become an easy target for attackers. This is what SPF record evaluation defaults to. Designated sender mechanisms are a , mx , ptr , ip4 , ip6 , and exists. The all mechanism matches any IP address. It's often used at the end of an SPF record to provide an explicit result when no match is found for all previous mechanisms. Mechanisms after "all" will never be checked.

To properly authenticate the emails sent from their servers, you must "include" their SPF records in yours. To do so, use the include mechanism on each one of such services. The a mechanism matches if the client IP address is one of the IP addresses specified in the mechanism. For example, suppose this SPF record is published on domain example.

All the A records for all the MX records for domain are tested. If the client IP is found among them, this mechanism matches.