RE: dynamic DNS and SPF?

> and if im using my isp's mail server, i just put that in as the ip?
> hmmmm. my isp wont give me a PTR. so, im kind of screwed...
If they only give you an IP address (not a host name), then use it.

But ideally you wouldn't use an IP address because they might change that (move 
the server to a different subnet due to security or management reasons). If you 
are relaying through a host name like "smtp.ntl.com", then this would be best:
"v=spfv1 a:smtp.ntl.com -all"

Michael R. Brumm