On 19/03/2023 18:32, Jeremy Ardley wrote:
On 19/3/23 18:28, cor...@free.fr wrote:
"v=spf1 ip4:188.66.63.1/24 -all"
According to an AI version 4 that cannot be named:
This is an SPF (Sender Policy Framework) record, which is a TXT record
in a domain's DNS settings. SPF records are used to help prevent email
spoofing by specifying which mail servers are authorized to send email
on behalf of a domain.
In this SPF record:
* |v=spf1|: This indicates the SPF version used is SPF1.
* |ip4:188.66.63.1/24|: This specifies that the IPv4 address range
188.66.63.1 to 188.66.63.254 (a /24 range) is authorized to send
email on behalf of the domain.
* |-all|: This means that any host not listed in the SPF record (or
not within the authorized IP range) is not allowed to send email on
behalf of the domain.
To answer your question, this SPF record specifies a /24 range
(188.66.63.1 to 188.66.63.254) rather than a single host. Any mail
server with an IP address within that range is authorized to send
email for the domain, while other mail servers are not allowed.
So,
* 188.66.63.1/24 is a range, not a single host in SPF
* why it's not written as 188.66.63.0/24 which is more clear?
Thanks
