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Alex van den Bogaerdt wrote:
On Mon, Jan 29, 2007 at 03:46:52PM -0600, Seth Goodman wrote:
asterisk A 1.2.3.5
inbound1 A 1.2.3.6
inbound2 A 1.2.3.7
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
a:outbound2.example.com -all"
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 1.2.3.6
A(outbound1.example.com) needs an extra lookup, via CNAME.
Well, yeah, but that doesn't make it "ugly". Following that logic, using
"mx:" in SPF records would be ugly, too, because it requires extra look-ups
that could theoretically be avoided.
It may not be optimally efficient at run-time, but it may improve mainte-
nance efficiency.
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