How would this be implemented if a number of local ISPs are being used to
send mail for customer domains without having to keep a list of all of them?
Here's a sample including a few ISPs, but compiling a complete list seems
pointless...
"v=spf1 mx include:rr.com include:verizon.com include:aol.com ~all"
I would want anything from our MXs to pass, but I wouldn't want a failure
result if it doesn't come from our MXs. I'm assuming the soft fail in the
generic case below is probably the best setup?
"v=spf1 mx ~all"
Darin.
----- Original Message -----
From: "R. Scott Perry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 24, 2004 10:42 AM
Subject: Re: [IMail Forum] OT: SPF
>As a result, I got this:
>
>domain.tld IN TXT "v=spf1 ip4:ip.add.re.ss1 ip4:ip.add.re.ss2 a:FQDN1
>a:FQDN2 mx:FQDN1 mx:FQDN2 include:OtherDomain -all"
I'll assume it is syntactically correct (all the munging makes that
impossible to determine). In this case, anyone can send mail from
domain.tld if they are coming from:
[1] either of the 2 IPs that you supplied,
[2] an IP in the A record of FQDN1 or FQDN2
[3] an IP in the MX record of FQDN1 or FQDN2
[4] any IP that meets the requirements of the OtherDomain's SPF record.
-Scott
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