DNS blacklist

[MikeDawg]

sam wrote:
> Hi,
>
> Hi, I tried to send an email to the following address (example only),
> but it bounced back with the following error msg in Postfix mail server.
> The postfix mail log said that,
>
> to=<anbc at roosf.com.au>, relay=10.1.131.4[10.1.131.4], delay=1,
> status=bounced (host 10.1.131.4[10.1.131.4] said: 550 DNS Blacklist (in
> reply to RCPT TO command))
>
> What is this means?
>
> Thanks
> S

This is actually something that is occuring with SMTP, and not DNS
related.  It looks like the SMTP server at 10.1.131.4 is running
probably some sort of dnsrbl, and therfore blocking you because you're
not on a static IP.