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Issue
3,328
IPv4 addresses
0
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
Terms
include:
_spf.interdns.co.uk
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
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
or else
a
pass
if the sender's IP address is in the A or AAAA record of this domain.
or else
ptr:
.
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 include:_spf.interdns.co.uk mx a ptr ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
8 x ip4 -all