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List Info
Thread: Setting up SPF Records
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| Setting up SPF Records |
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2006-12-05 02:58:59 |
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Sometime ago you sent a message on this subject pointing to the SPF
wizard at
http://spf.pobox.com
Last week when our DNS provider was given a nice DDoS attack taking down
all 4 of their servers located at geographically diverse locations we got
the message that we probably should be using at least two DNS
providers. We were toying with it because the primary one does not
provide TXT records. So now I am struggling with setting up the
correct entries. We use a single IP address to send out all email
for all domains although we found that it is possible for this IP address
to go down on us (It is a separate feed and not in the same subnet as our
other addresses). But we also found when it went out one time that
Surgemail defaulted to an address we normally use for administration
purposes.
So we now have two A records in the DNS entries for our primary domain
which are smtp.awasco.com and smtp2.awasco.com reflecting the IP
addresses for Surgemail.
In running a test scenario through the wizard I ended up with the
following string:
awasco.com. IN TXT "v=spf1 a:smtp.awasco.com a:smtp2.awasco.com
~all"
Does this look right to you?
Now some time back Barry also indicated that it is best to use
"-all" rather than "~all" and although you used a
"-all" in an example you later corrected it to
"~all"
And can you elaborate on the difference in actions between the
"-all" and "~all" parameters?
Now I think the reason this does not include the "MX" parameter
presumably is that we never send on the incoming address(es) pointed to
by the MX records.
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