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
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