Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!ncar!hsdndev!rutgers!maverick.ksu.ksu.edu!ux1.cso.uiuc.edu!mp.cs.niu.edu!rickert From: rickert@mp.cs.niu.edu (Neil Rickert) Newsgroups: comp.mail.sendmail Subject: Re: Trusted user "From" on Sun's Message-ID: <1991Jan18.033411.26772@mp.cs.niu.edu> Date: 18 Jan 91 03:34:11 GMT References: <29816@shamash.cdc.com> <1991Jan12.004131.5593@mp.cs.niu.edu> Organization: Northern Illinois University Lines: 33 In article barnett@crdgw1.ge.com writes: >>>Unparseable user wants >>>to be > >Hmm. I have a similar error on our Ultrix machine. This usually >happens when mail comes in with the address > > user@machine > This problem is all too common. It is not caused by your machine, but by the machine which sent you the mail. A common cause is use of 'sendmail.subsidiary.cf' instead of 'sendmail.main.cf' when sending from a Sun or similar system. (Why does the default setup use the subsidiary version - sigh?) >What has to be done to make sure all Internet mail connections have >proper hostnames? What really has to be done is for system vendors to take more care in their default setup. As for what you can do, about the only solution I know of is to install the IDA version of sendmail. The current version - 5.65a+IDA-1.4.2 - uses the result of a nameserver lookup to convert user@machine to user%machine@sending.domain.name, on the assumption that the domain which directly sent you the mail probably knows the identity of 'machine'. -- =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*= Neil W. Rickert, Computer Science Northern Illinois Univ. DeKalb, IL 60115 +1-815-753-6940