Will Senn wrote:
wechsler,
and to top it all off, I implemented correctly (i think):
v=spf1 a/25 ptr mx/25 -all
that look reasonable for the low 128 servers?
My brain has passed the point of the night at which I can manage CIDR
maths, but that's a valid record.
However I suspect (if all the servers in question are in the same subnet
as your MX server) that simply:
v=spf1 mx/25 ?all
would be your best bet. Servers included by one rule do not need to be
re-specified by another, and I assume that a/25 and mx/25 have identical
meainging in your network.
Only if there are hosts in yourdomain.com do you need the ptr rule as well.
If all your outgoing servers are also listed as mx servers you don't
need the /25 either.
?all will protect you against transitional risks documented at:
http://spfwiki.infinitepenguins.net/pmwiki.php/SenderPermittedFrom/FixingForwarding
Wechsler
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