On 2/8/2010 6:28 PM, John R Levine wrote:
ISP in the UK. Can you describe the DNS changes needed if they were
publishing a spam button address?
$ dig mail.btinternet.com a
;; ANSWER SECTION:
mail.btinternet.com. 600 IN CNAME pop-smtp.bt.mail.yahoo.com.
pop-smtp.bt.mail.yahoo.com. 1800 IN CNAME
pop-smtp.bt.mail.fy5.b.yahoo.com.
pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.12.13.134
pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.146.188.192
I don't hack DNS records enought to be sure, but it appears to need
exactly one new record:
_report.pop-smtp.bt.mail.fy5.b.yahoo.com IN TXT
abuse-report(_at_)yahoo(_dot_)com
Nope, that won't work. CNAMEs don't do a partial match.
Then I guess it's lucky I didn't specify one.
_report.pop-smtp.bt.mail.fy5.b.yahoo.com IN TXT
abuse-report(_at_)yahoo(_dot_)com
_report.pop-smtp.bt.mail.yahoo.com IN TXT abuse-report(_at_)yahoo(_dot_)com
_report.mail.btinternet.com IN TXT abuse-report(_at_)yahoo(_dot_)com
That won't work, either. You can't have DNS records below a CNAME.
I'm not finding where that restriction specified among the list of restrictions
I can find, and apparently all of popular the summaries written about CNames
have missed it too.
Please cite the standards text that specifies it.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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