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IPv4 addresses
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IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 mx ptr ip4:203.146.127.132 mx:mail.tuart.netdesignhost.com ~all
Copied
Terms
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:
203.146.127.132 / 32
pass
if the sender's IP is between
203.146.127.132 and 203.146.127.132 (inclusive).
203.146.127.132 and 203.146.127.132 (inclusive).
CS LOXINFO Public Company Limited.
AS9891
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 mx ptr ip4:203.146.127.132 mx:mail.tuart.netdesignhost.com ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable