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Lookups
1
Issue
2,049
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
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
or else
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
ip4:
101.0.4.0 / 22
pass
if the sender's IP is between
101.0.4.0 and 101.0.7.255 (inclusive).
101.0.4.0 and 101.0.7.255 (inclusive).
PT. Universal Broadband
AS55670
or else
ip4:
103.12.28.0 / 22
pass
if the sender's IP is between
103.12.28.0 and 103.12.31.255 (inclusive).
103.12.28.0 and 103.12.31.255 (inclusive).
PT. Universal Broadband
AS55670
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 a mx ptr ip4:101.0.4.0/22 ip4:103.12.28.0/22 ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable