Sender domain must resolve problem

[Derek J. Balling]

At 8:46 PM +0200 10/12/00, Igmar Palsenberg wrote:
>  > >>> MAIL From:<rjd at rtds.com> SIZE=7931
>>  451 <rjd at rtds.com>... Sender domain must resolve
>
>nslookup rtds.com doesn't resolve. Sendmail requires it (actually, the map
>classes do)
>
>Add a
>
>rtds.com.		A	xxx.xxx.xxx.xxx to your DNS.

No, the sendmail lookups require either a valid MX record or a valid 
A record, and rtds.com has a valid MX:

$ dig rtds.com mx

; <<>> DiG 9.0 <<>> rtds.com mx
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48351
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

;; QUESTION SECTION:
;rtds.com.                      IN      MX

;; ANSWER SECTION:
rtds.com.               13252   IN      MX      10 mail.rtds.com.

[etc]

I would say that someone's ruleset is broken (and I know this 
empirically because I receive mail from *@yahoo-inc.com to my home 
address just fine, and "dig yahoo-inc.com a" will fail)

D