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Re: dynamic DNS and SPF?

2004-06-04 02:23:07
Michael R. Brumm wrote:
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"

*Ideally* they would actually provide their own SPF record for you to refer to:

"v=spfv1 redirect=customer.ntl.com"

They would then maintain the SPF TXT record for customer.ntl.com with an up to date list of the IP addresses of their outgoing mail servers, which may not be the same as the IP addresses that they accept submissions from customers on (i.e. the addresses corresponding to the name smtp.ntl.com or whatever).

Paul.


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