Mailing List Archive: SPF: Help

Creating spf record with multiple addresses

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RMoore at afsc

Aug 16, 2005, 9:24 AM

Post #1 of 3 (1138 views)
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Creating spf record with multiple addresses

Hello all--

I have an SPF record that's working just fine. My current record is
fairly straightforward: "v=spf1 a mx a:list.afsc.org ~all". Now I need
to add an additional piece to it and I'm not sure exactly how to do it.
We have a webserver with one IP address but multiple websites. More than
one of the websites sends mail. Do I need to include in my SPF record an
A record for each of the websites? Or will one A record do the trick for
all the websites? Would I be better off to just add a single IP address
to my SPF record? Can that be done? (In other words, is 65.36.166.154/31
valid?)

Thanks,
Rob

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Rob Moore
Network Manager
215-241-7870
American Friends Service Committee
1501 Cherry St.
Philadelphia, PA 19102
RMoore[at]afsc.org
Phone: 215-241-7870
Fax: 215-241-7204

Love is the only rational act.
--Morrie Schwartz

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spf2 at kitterman

Aug 16, 2005, 9:40 AM

Post #2 of 3 (1089 views)
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Re: Creating spf record with multiple addresses [In reply to]

Rob Moore wrote:
> Hello all--
>
> I have an SPF record that's working just fine. My current record is
> fairly straightforward: "v=spf1 a mx a:list.afsc.org ~all". Now I need
> to add an additional piece to it and I'm not sure exactly how to do it.
> We have a webserver with one IP address but multiple websites. More than
> one of the websites sends mail. Do I need to include in my SPF record an
> A record for each of the websites? Or will one A record do the trick for
> all the websites? Would I be better off to just add a single IP address
> to my SPF record? Can that be done? (In other words, is 65.36.166.154/31
> valid?)
>
It is a valid way to express the range 65.36.166.154 - 65.36.166.155.
In SPF terms, what you add to your record is ip4:65.36.166.154/31. If
you just want 65.36.166.154, then it would just be ip4:65.36.166.154.

That would make your record something like:

"v=spf1 ip4:65.36.166.154/31 a mx a:list.afsc.org ~all"

It works fine in any order, but if you put the ip4: mechanism first,
then messages that match that don't need any DNS lookups. It's less
resource intensive for everyone.

Scott K

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RMoore at afsc

Aug 16, 2005, 10:45 AM

Post #3 of 3 (1120 views)
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Re: Creating spf record with multiple addresses [In reply to]

Thanks! That's exactly what I needed.

Rob

-----Original Message-----
From: Scott Kitterman [mailto:spf2[at]kitterman.com]
Sent: Tuesday, August 16, 2005 12:40 PM
To: spf-help[at]v2.listbox.com
Subject: [SPAM] - Re: [spf-help] Creating spf record with multiple
addresses - Email found in subject

Rob Moore wrote:
> Hello all--
>
> I have an SPF record that's working just fine. My current record is
> fairly straightforward: "v=spf1 a mx a:list.afsc.org ~all". Now I need

> to add an additional piece to it and I'm not sure exactly how to do
it.
> We have a webserver with one IP address but multiple websites. More
> than one of the websites sends mail. Do I need to include in my SPF
> record an A record for each of the websites? Or will one A record do
> the trick for all the websites? Would I be better off to just add a
> single IP address to my SPF record? Can that be done? (In other words,

> is 65.36.166.154/31
> valid?)
>
It is a valid way to express the range 65.36.166.154 - 65.36.166.155.
In SPF terms, what you add to your record is ip4:65.36.166.154/31. If
you just want 65.36.166.154, then it would just be ip4:65.36.166.154.

That would make your record something like:

"v=spf1 ip4:65.36.166.154/31 a mx a:list.afsc.org ~all"

It works fine in any order, but if you put the ip4: mechanism first,
then messages that match that don't need any DNS lookups. It's less
resource intensive for everyone.

Scott K

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