Alex van den Bogaerdt quoted:
www CNAME example.com.
ftp CNAME example.com.
asterisk A 188.8.131.52
inbound1 A 184.108.40.206
inbound2 A 220.127.116.11
outbound1 CNAME inbound1.example.com.
outbound2 CNAME inbound2.example.com.
MX 5 inbound1.example.com.
MX 9 inbound2.example.com.
TXT "v=spf1 a:outbound1.example.com
Ugly. Please do not follow this example. List only hosts
that are "A", not "CNAME", in your SPF records.
A(inbound1.example.com) directly results in 18.104.22.168
A(outbound1.example.com) needs an extra lookup, via CNAME.
RFC 1033 states:
| NIC.ARPA. CNAME SRI-NIC.ARPA.
| There must not be any other RRs associated with a nickname
| of the same class.
Apparently there are some RRs of the same CLASS (IN) associated
with "outbound2" in the example above, or did I miss a clue ?
And Seth mentioned to "extract the domain from the HELO FQDN",
if that describes anything else but "take the FQDN as is" it's
wrong wrt HELO checks by SPF.
Sender Policy Framework: http://www.openspf.org/
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