Sebastian Nielsen via mailop skrev den 2024-02-11 18:33:
It’s a matter of a simple configuration.
checked spf for big domains:
gmail.com 328,960 individual IPv4 addresses
outlook.com 506,999 individual IPv4 addresses (65.55.238.128/26 listed
twice in spf)
hotmail.com 148,087 individual IPv4 addresses (65.55.238.128/26 listed
twice in spf)
facebook.com 1,792 individual IPv4 addresses no ipv6 in spf
if spf should be pr email addresses, thay could add ipv6 pr sender email
:=)
and have ipv4 with nullMX or simply remove ipv4 in mx, will it ever
happen ?
if anything is free it will be abused, it have being so like internet
was born, today solutions are many but none will do the hard work on
progress
f...@userid.gmail.com single spf ip with ipv4 and ipv6
b...@o365user.morefun.long.domain.names.outlook.com single spf ip with
ipv4 and ipv6
that first step to not share ips pr user
when this are mapped, then spf is more useful then it is now with easily
forged spf as now
a very pro one here https://dmarcian.com/spf-survey/?domain=yahoo.com
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