Date: Tue, 23 May 2000 13:55:14 +0200 From: Christoph Sold <so@server.i-clue.de> To: Willem Brown <willem@brwn.org> Cc: questions@FreeBSD.ORG Subject: Re: DNS and e-mail. Message-ID: <392A71A2.487BEF4F@i-clue.de> References: <392A6565.B3E2FDD8@brwn.org>
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Willem,
sendmail in recent versions checks the the sender's domain resolves both
forward ("mail.expample.org" -> 1.2.3.4) and backwards
("4.3.2.1.in-addr.arpa." -> "mail.example.org"), to make life more
difficult for spammers. Some other MTAs may check this, too.
-Christoph Sold
Willem Brown wrote:
> Hi,
>
> I'm running a secondary DNS for my domain which is
> hosted by Granitecanyon. The idea was that whenever the two
> main DNS servers are unavailable that mine will be used so
> I don't get cut off from the world completely.
>
> Every time I send a e-mail to the questions mail list,
> it would seem that every mail server that receives that e-mail
> queries my puny DNS server. Practically DOSsing it, well
> maybe not quite.
>
> Normally I don't see much DNS traffic if any at all
> because the main servers is far better connected and capable.
>
> What then causes my DNS to be queried when I send an
> e-mail to the list? Any ideas?
>
> Regards
> Willem Brown
> --
> |--------------LINUX & *BSD, the CHOICE is yours--------------|
>
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