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Lookups
1
Issue
2
IPv4 addresses
0
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
Terms
a
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
ip4:
203.128.73.54 / 32
pass
if the sender's IP is between
203.128.73.54 and 203.128.73.54 (inclusive).
203.128.73.54 and 203.128.73.54 (inclusive).
Neuviz Net
AS18103
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 a ptr ip4:203.128.73.54 ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable