It does this by looking up the DNS for the SPF record on the email domain, checking if the connecting host's IP is on the list specified by the SPF record. If so, the email passes SPF authentication; otherwise i
SPF records are generally text-only, and components are separated by spaces. The default qualifier is pass, so SPF records can be terse. Mechanisms with parameters like domains or IP addresses are entered in the SPF record after the mechanism name and a colon, for example: v=spf1...
For an example of an SPF record that includes the line of text, see below. The following example uses Google Workspace as the mail server and our US IP addresses: v=spf1 include:_spf.google.com include:_spf.psm.knowbe4.com ~all After you update your SPF records, we recommend...
TXT:文本长度限制 255,通常做 SPF 记录(反垃圾邮件)。 MX:将域名指向邮件服务器地址(邮件服务器的域名)。 PTR:将 IP 地址指向一个域名。 SRV:记录提供特定的服务的服务器(格式为 优先级 权重 端口 目标地址,每项中间需以空格分隔)。 说明 添加PTR 记录前需要先配置反解 Zone,具体操作请参考反向解析及 PTR ...
An SPF record. A technology that authenticates the identity of an email sender using an IP address. It is a very efficient spam solution. The recipient will first check the domain's SPF record to determine whether the sender's IP address is included in the SPF record. If it is included...
Record Type: TXT (Text) Host: @ TXT Value: v=spf1 include:spf.protection.outlook.com -all TTL: 3600 Save the record. Validate your SPF record by using one of these SPF validation tools SPF is designed to help prevent spoofing, but there are spoofing techniques that SPF can't protect ...
A Record Address record, IPv4 address used to specify domain name (e.g.: 8.8.8.8), and if the domain name needs to be pointed to an IP address, it is needed to add a record. Record type: A Host record: The host record is domain name prefix with common usages including: 1.ww...
Record Type:TXT (Text) Host:@ TXT Value:v=spf1 include:spf.protection.outlook.com -all TTL:3600 Save the record. Validate your SPF record by using one of theseSPF validation tools SPF is designed to help prevent spoofing, but there are spoofing techniques that SPF can't protect against....
Record Type: TXT (Text) Host: @ TXT Value: v=spf1 include:spf.protection.outlook.com -all TTL: 3600 Save the record. Validate your SPF record by using one of these SPF validation tools SPF is designed to help prevent spoofing, but there are spoofing techniques that SPF can't protect ...
Thus, SPF gives other mailservers a way to verify that mail claiming to be from your domain is sent from one of your authorized IP addresses. They do this by checking a special TXT record configured in the domain name zone. It helps to establish the legitimacy of the domain...