v=spf1 ip4:192.168.0.0/16~all We can include as many IP addresses, both IPv4 and IPv6, or even subnet ranges as we wish. For example, we could amend the previous record like so: v=spf1ipv4:219.0.188.54ipv6:2001:0db8:85a3:0000:0000:8a2e:0370:7334ip4:192.168.0.0/16~all 2. Red...
A mechanism is a way to specify a range of IP addresses. Eight mechanisms are defined: IP4: If the sender is in a given IPv4 address range, match; IP6: If the sender is in a given IPv6 address range, match: A: If the domain name has an address record (A or AAAA) th...
Example: v=spf1 2. IP4 tag The IP4 tag in an SPF record is a critical element that specifies authorized IPv4 addresses for sending emails to a domain. It’s crucial for email security and deliverability. By clearly specifying which IP addresses can send emails, you reduce the risk of emai...
IP4refers to the IPv4 network address. This mechanism can be specified as a network range when the address is provided with the prefix length to specify subnetting or as a single IPv4 address when specified without the prefix length. IP6refers to theIPv6 network address, which can ...