What are SPF mechanisms (e.g., ip4, a, mx, include)?
Mechanisms define which servers are authorized. The main ones are:
- ip4 authorizes a specific IPv4 address or range.
- a authorizes the IPs of the domain’s A record.
- mx authorizes the IPs of the domain’s MX records.
- include imports the SPF policy of another domain.
Mechanisms are the items on the ship registry showing which vessels carry the domain’s colors.
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