> Date: Thu, 06 Sep 2001 15:08:31 -0400
> From: Mail Delivery System <Mailer-Daemon@???>
> To: djc@???
> Subject: Mail delivery failed: returning message to sender
>
> This message was created automatically by mail delivery software
> (Exim).
>
> A message that you sent could not be delivered to one or more of its
> recipients. This is a permanent error. The following address(es)
> failed:
>
> Kevin.sindhu@???
> SMTP error from remote mailer after RCPT TO:<Kevin.sindhu@???>:
> host mail.open-systems.org [24.76.172.29]: 550 relaying to <Kevin.sindhu@???> prohibited by administrator
>
> ------ This is a copy of the message, including all the headers. ------
>
Apparently this didnt go through, but it illustrates the problem better.
Hopefully the administrator of that domain/system somehow gets messages
posted to the list, so they can fix this.
This is ancillary to his original question, which was about MX records
pointing at hosts with only AAAA records - that is fine, but in this
case it appears the secondary MX (mail.open-systems.org) (with a regular
A record), is misconfigured - in that it will not relay mail for the
domain for which it is listed as an MX.
$ dig devil.postfix.ca mx
;; ANSWER SECTION
devil.postfix.ca. 54m13s IN MX 5 mail.open-systems.org.
devil.postfix.ca. 54m13s IN MX 0 devil.postfix.ca.
;; ADDITIONAL SECTION:
mail.open-systems.org. 10h34m18s IN A 24.76.172.29
devil.postfix.ca. 54m13s IN AAAA 3ffe:1200:3028:8d6b:a00:20ff:fef8:62c0
