3 / 10
Lookups
1
Issue
3
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.
or else
mx
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:
75.101.148.52 / 32
pass
if the sender's IP is between
75.101.148.52 and 75.101.148.52 (inclusive).
75.101.148.52 and 75.101.148.52 (inclusive).
Amazon.com
AS14618
or else
ip4:
107.20.210.250 / 32
pass
if the sender's IP is between
107.20.210.250 and 107.20.210.250 (inclusive).
107.20.210.250 and 107.20.210.250 (inclusive).
Amazon.com
AS14618
or else
-all
fail
the email's SPF check.
Included records
v=spf1 a mx ptr ip4:75.101.148.52 ip4:107.20.210.250 -all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable