** On May 17, brian moore scribbled: > On Wed, May 17, 2000 at 06:33:04PM +0200, Marek Habersack wrote: > > Hi *, > > > > Take a look at the message below. I have just received it from the > > debian-user list. There would be nothing strange in it if not for the fact > > that the person who posted it (apparently from the wcom.com domain as seen > > in the full logs) appears to have an address bolan@debian.vip.net.pl - that > > is in _my_ domain :)). The problem is that neither no bolan or > > debian.vip.net.pl exist! Our mailer is not an open relay, the user posted it > > from the wcom.com domain (see the attached full logs). > > I wonder whether the other people on the list received posts from > > bolan@debian.YOUR.DOMAIN.COM? > > They would if they had a host named 'debain.YOUR.DOMAIN.COM'. The thing is I _don't_ have debian.VIP.NET.PL and still I got the message with such address. > Sendmail (and probably other smtp servers) tries to canonify names in > headers. This is a semi-helpful process, but it usually is correct to > do. (See RFC1123, section 5.2.18, which mandates using fqdn's which is > why sendmail, trying to be nice, tries to fix partial names it sees.) I use postfix and I suppose it does the same. In the situation where the lookup fails I suppose postfix appended my domain name even though the host with such derived name doesn't exist. > Sites without a machine named 'debain.whatever.com' (ie 'nslookup > debian' fails) will leave it as 'bolan@debian'. Not what happened here... > Even more obvious of the same thing is people who send mail as just > 'username' which gets canonified as username@whatever.com by each > recipient. (Spammers do this reasonably often judging from how often > our users complain about it.) The original poster apparently used Exim, which does canonicalize local user names, unless it is misconfigured. > Looks like the original sender needs to fix their mail setup to use the > fqdn. he, or one of the several relays that lie between him and the outer world... marek
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