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Lookups
1
Issue
5
IPv4 addresses
0
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 ptr a:mta1.hix.nl a:mta2.hix.nl a:mta1b.hix.nl a:mta2b.hix.nl a:mtacluster.hix.nl ~all
Copied
Terms
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
a:
mta1.hix.nl
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
a:
mta2.hix.nl
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
a:
mta1b.hix.nl
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
a:
mta2b.hix.nl
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 ptr a:mta1.hix.nl a:mta2.hix.nl a:mta1b.hix.nl a:mta2b.hix.nl a:mtacluster.hix.nl ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable