Here are some common mechanisms used in SPF records:
- v=spf1: Indicates the SPF version. - ip4: Specifies an IPv4 address. - ip6: Specifies an IPv6 address. - a: Refers to the domain’s A record. - mx: Refers to the domain’s MX record. - include: Allows the SPF record to include records from another domain. - all: Specifies the default rule for all other cases.