5 / 10
Lookups
1
Issue
10,622
IPv4 addresses
1.42 ⋅ 10
22
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 include:_spf.frontier.com include:_spf2.frontier.com include:_spf.mail.yahoo.com ~all
Copied
Terms
include:
_spf.frontier.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
include:
_spf2.frontier.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
include:
_spf.mail.yahoo.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 include:_spf.frontier.com include:_spf2.frontier.com include:_spf.mail.yahoo.com ~all
15 x ip4 3 x ip6 ~all
2 x ip4 ~all
1 x ip4 ptr:yahoo.com ptr:yahoo.net ?all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
IP ranges
2001:1960:20:6000::
/ 56
Verizon Business
AS5650
2001:1960:20:6000::
2001:1960:20:60ff:ffff:ffff:ffff:ffff
2001:1960:20:1000::
/ 56
Verizon Business
AS5650
2001:1960:20:1000::
2001:1960:20:10ff:ffff:ffff:ffff:ffff
