On Thu, 2 May 2002, Pierre Fortin wrote:

> On Thu, 2 May 2002 14:46:23 -0400 "jay" <[EMAIL PROTECTED]> wrote:
>
> > I am currently using Mandrake 8.2 (Kernel-secure) running Postfix and
> > Imap. I use Imp/horde (horde.org) for webmail. Everything is fine except
> > I cannot send mail to the expert/newbie mailing lists. Here is the error
> > I get.
> >
> >                         The Postfix program
> >
> > <[EMAIL PROTECTED]>: host smtp.mandrax.org[63.209.80.242] said:
> > 450
> >     Client host rejected: cannot find your hostname.
> >
> > How can I fix this? I need smtp.mandrax.org to be able to determine my
> > host name.
>
> You need a registered name to go with the IP address you are using; then,
> the name your postfix claims to be must match.  The gist of the problem is
> this:  your postfix connects to smtp.mandrax.org and identifies itself,
> say as foo.bar.com...  a few packets back and forth and smtp.mandrax.org
> checks with DNS to see if your IP address matches the claimed host
> (foo.bar.com).  If the reverse DNS lookup fails or doesn't match; your
> connection is denied.
>
> Just because you can be reached as foo.bar.com is not enough, your IP
> address has to return foo.bar.com...
>
> Using the headers in your post:
> > Received: from jason ([24.157.184.123]) by
> >     fep02-mail.bloor.is.net.cable.rogers.com
>
> First, "jason" is not a fully-qualified name and definitely not in the
> global DNS.
>
> A reverse lookup gives:
> $ host 24.157.184.123
> Host 123.184.157.24.in-addr.arpa not found: 3(NXDOMAIN)
>
> So there is no way you can send to the lists directly; you must use your
> ISP's mailer which hopefully is properly setup in DNS...
>
> My postfix is likewise setup to deny unknown hosts, so you can't send mail
> directly to me either.
>
> If you get a different IP address each time, you are probably wasting your
> time trying to setup your own mailer, AFAIK.
>
> HTH,
> Pierre

I know that this is the way it is, but it sucks that things have to be
this way. :\

-- 
daRcmaTTeR
----------
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