[afnog] SMTP server rejecting domain

[Sunday Adekunle Folayan]

At 01:06 PM 6/2/2006, Mangaliso Jere wrote:
>Good people
>
>The I have a client whose uses our SMTP server but lately in the logs
>am getting the following and he cant even send mails
>
>Jun  1 13:24:46 nyandeni sendmail[12526]: k51BOegj012526:
>ruleset=check_mail, arg1=<asmwale at cedrisa.org>, relay=[196.45.190.62],
>reject=451 4.1.8 Domain of sender address asmwale at cedrisa.org does not
>resolve
>Jun  1 13:24:47 nyandeni sendmail[12526]: k51BOegj012526:
>from=<asmwale at cedrisa.org>, size=0, class=0, nrcpts=0, proto=SMTP,
>daemon=MTA, relay=[196.45.190.62]
>Jun  1 13:24:47 nyandeni sendmail[12526]: k51BOegk012526:
>ruleset=check_mail, arg1=<asmwale at cedrisa.org>, relay=[196.45.190.62],
>reject=451 4.1.8 Domain of sender address asmwale at cedrisa.org does not
>resolve
>
>When I do the following
>dig cedrisa.org any
>
>;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 62335
>;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
>
>;; QUESTION SECTION:
>;cedrisa.org.                   IN      ANY
>
>;; Query time: 560 msec
>;; SERVER: 196.45.190.25#53(196.45.190.25)
>;; WHEN: Fri Jun  2 15:50:15 2006
>;; MSG SIZE  rcvd:


 From here: dig cedrisa.org any
;; ANSWER SECTION:
cedrisa.org.            23h57m35s IN NS  chambo.sdnp.org.mw.
cedrisa.org.            23h57m35s IN NS  domwe.leland-mw.org.

;; AUTHORITY SECTION:
cedrisa.org.            23h57m35s IN NS  domwe.leland-mw.org.
cedrisa.org.            23h57m35s IN NS  chambo.sdnp.org.mw.

  dig @196.45.190.25 cedrisa.org any
Gives .... Nothing.

  o Check that your /etc/resolv.conf points to the correct DNS Server
  o Check your DNS Server running on 196.45.190.25
  o Check your recently added firewall rules, that you are not blocking TCP 
and UDP ports 53. DNS is not only UDP :-)

Regards ..

SF.
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