Re: Backward compatibility with deployed SPF records (and choice of doma

On 6/26/2004 5:19 AM, Hector Santos wrote:

> So the customer was right about his ISP saying it was illegal to use
> _EP.hostname.com for a TXT record?
A domain name contains a series of labels.

Any label may contain character codes 0x00 through 0xFF.

A hostname may only contain labels with a-z, A-Z, 0-9, and "-" (there are
length and ordering restrictions too).

A TXT RR can be associated with any domain name and is not limited to
hostnames. The ISP is wrong.

-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/