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1
Issue
518
IPv4 addresses
7.92 ⋅ 10
28
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 mx a ptr include:spf.spamcluster.nl include:spf.mydomainprovider.com ?all
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Terms
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
3 IPv4 addresses
3 IPv6 addresses
or else
a
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
1 IPv6 address
or else
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
include:
spf.spamcluster.nl
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
include:
spf.mydomainprovider.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
?all
Don't state if this IP is allowed to send this email.
Included records
v=spf1 mx a ptr include:spf.spamcluster.nl include:spf.mydomainprovider.com ?all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
3 x ip4 3 x ip6 ~all
1 x ip4 ~all