5 / 10
Lookups
1
Issue
458,756
IPv4 addresses
2.19 ⋅ 10
24
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 mx ptr include:_spf.salesforce.com include:spf.protection.outlook.com ~all
Copied
Terms
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
4 IPv4 addresses
4 IPv6 addresses
or else
ptr:
.
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
include:
_spf.salesforce.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
Salesforce
CRM
or else
include:
spf.protection.outlook.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
Microsoft 365 / Outlook
Inbox software
or else
~all
soft fail
the email's SPF check.
Included records
v=spf1 mx ptr include:_spf.salesforce.com include:spf.protection.outlook.com ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
exists:%{i}._spf.mta.salesforce.com -all
6 x ip4 5 x ip6 -all
IP ranges
2a01:111:f403:8000::
/ 51
Microsoft
AS8075
2a01:111:f403:8000::
2a01:111:f403:9fff:ffff:ffff:ffff:ffff
2a01:111:f403:c000::
/ 51
Microsoft
AS8075
2a01:111:f403:c000::
2a01:111:f403:dfff:ffff:ffff:ffff:ffff
2a01:111:f403:f000::
/ 52
Microsoft
AS8075
2a01:111:f403:f000::
2a01:111:f403:ffff:ffff:ffff:ffff:ffff