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Re: [Asrg] overloading server names doesn't work, was who has the message

2010-02-08 20:28:31
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.

_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.

By the way, I was wrong about SRV records. This DNS hack just doesn't work, but it won't work much more elegantly with RP records. See RFC 1183.

Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
"I dropped the toothpaste", said Tom, crestfallenly.
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