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On Wed, 20 Oct 1999, Daniel P. Katz wrote: > b) Is this an intentional security feature or a configuration error? It's actually a combination of the two. Here's what's going on: > ------------------------------------------------------------------------- > bishop:/users/dkatz[1]% mail -v dkatz at cam-katz [snip!] > >>> RCPT To:<dkatz at dhcp-250-11.kenan.com> > 550 <dkatz at dhcp-250-11.kenan.com>... Relaying denied Do you notice a difference here? What's going on is that somehow cam-katz is getting translated into dhcp-250-11.kenan.com. Assumedly, cam-katz doesn't know about the dhcp* name, so it's rejecting the mail, on the reasoning that someone is trying to use it to send mail to another machine (also known as relaying, a favored technique of spammers). This is both a configuration problem (due to DNS issues, or not listing all the recognized names in the proper /etc/mail/* file under RedHat), and a security problem (trying to stop the spam). To fix it, I'd suggest either getting bishop to recognize cam-katz as such, or add dhcp-250-11.kenan.com to the appropriate /etc/mail/* file. I think that there might be another option - configuring it to accept mail for all of kenan.com - but that might not be what you want. > dkatz at cam-katz... User unknown I'm guessing this is the friendly error message from /bin/mail that corresponds to a 550 SMTP error code. --Mark - Subcription/unsubscription/info requests: send e-mail with "subscribe", "unsubscribe", or "info" on the first line of the message body to discuss-request at blu.org (Subject line is ignored).
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