SPF Records ??

The path through which you receive and retrieve your email is irrelevant. It has nothing to do with SPF.

What you'll want to specify, in your SPF record, is the list of hosts that can *send* email using your email address. That would include the Cox SMTP servers that push your mail out to the outside world. It

*might* also need to includ the IP address that you use to send outbound email to Cox - probably not, through, if you're using any sort of authenticated connection to hand off the mail to Cox.

You can specify the Cox servers in your SPF record in any of several different ways, each having advantages and disadvantages:

(1) Individually, by IP address. (2) By IP address range (3) By referencing a Cox domain or sub-domain that has an SPF record. In your case I suspect that approach (2) is likely to be the way to go... figure out which IP subnet Cox is using for the outbound SMTP servers that serve your area, and specify that subnet. You'll have to depend on Cox making sure that *other* Cox customers can't forge outbound email using your domain name... they ought to be providing you with an "authentication required" mail submission port which does some amount of user and domain validation.

--
Dave Platt                                    AE6EO
Friends of Jade Warrior home page:  http://www.radagast.org/jade-warrior
  I do _not_ wish to receive unsolicited commercial email, and I will
     boycott any company which has the gall to send me such ads!

just use this site

fill in the domain box and click go, you can fiddle with it from there.