Sender Policy Framework

Mechanism/ip4

The "`ip4`" mechanism (edit)

ip4:<ip4-address>
ip4:<ip4-network>/<prefix-length>

The argument to the "ip4:" mechanism is an IPv4 network range. If no prefix-length is given, /32 is assumed (singling out an individual host address).

Examples:

"v=spf1 ip4:192.168.0.1/16 -all"

Allow any IP address between 192.168.0.1 and 192.168.255.255.

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Sender Policy Framework

Mechanism/ip4

The "ip4" mechanism (edit)

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The "`ip4`" mechanism (edit)