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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 include:spf.smtp-proxy.smartcitytelecom.com -all
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Terms
ptr:
.
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
include:
spf.smtp-proxy.smartcitytelecom.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
fail
the email's SPF check.
Included records
v=spf1 ptr include:spf.smtp-proxy.smartcitytelecom.com -all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
1 x ip4 -all