From owner-freebsd-isp  Thu Jul  1  6:37:59 1999
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Subject: Re: Sendmail 8.9.x check_mail anti-spam rule broken?
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> For example,   some.one@btinternet.com gets rejected.  But btinternet.com
> has perfectly valid MX records.  BT Internet is probably one of the UK's
> biggest ISPs.

They may be one of the UK's biggest ISPs. That doesn't mean they have
a clue:

- It appears that both of the btinternet.com name servers are on the
same LAN segment (certainly behind the same router):

btinternet.com.         NS  dns1.btinternet.com.
btinternet.com.         NS  dns2.btinternet.com.

dns1.btinternet.com.    A   194.73.73.95
dns2.btinternet.com.    A   194.73.73.94

and both behind a router at 194.74.74.71.

(For that matter, both of their MX hosts also sit behind this same router.)

- Neither of the btinternet.com name servers are authoritative for
btinternet.com.


This doesn't exactly give me great faith in BT Internet...

Steinar Haug, Nethelp consulting, sthaug@nethelp.no


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