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Lookups
1
Issue
49
IPv4 addresses
0
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 mx ptr a:mail.viettel.com.vn a:smtp.viettel.com.vn a:mailfilter-out-01.viettel.com.vn mx:mailfilter-in-01.viettel.com.vn a:mailfilter03.viettel.com.vn ip4:125.235.240.32/27 ip4:203.190.168.16/29 a:mailfilter-in-02.viettel.com.vn -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:
.
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
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
pass
if the sender's IP address is in the A or AAAA record of this domain.
4 IPv4 addresses
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
ip4:
125.235.240.32 / 27
pass
if the sender's IP is between
125.235.240.32 and 125.235.240.63 (inclusive).
125.235.240.32 and 125.235.240.63 (inclusive).
Viettel Group
AS7552
or else
ip4:
203.190.168.16 / 29
pass
if the sender's IP is between
203.190.168.16 and 203.190.168.23 (inclusive).
203.190.168.16 and 203.190.168.23 (inclusive).
Viettel
AS24086
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
fail
the email's SPF check.
Included records
v=spf1 mx ptr a:mail.viettel.com.vn a:smtp.viettel.com.vn a:mailfilter-out-01.viettel.com.vn mx:mailfilter-in-01.viettel.com.vn a:mailfilter03.viettel.com.vn ip4:125.235.240.32/27 ip4:203.190.168.16/29 a:mailfilter-in-02.viettel.com.vn -all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable