On Tue, 2005-11-08 at 00:12 -0600, Les Mikesell wrote: > On Mon, 2005-11-07 at 22:55, Jay Moore wrote: > > > Bottom Line: Having found this trove of knowledge, I *think* my best > > course of action is to fix (right after I find it) the sendmail startup > > to remove the "-bd" option, then start hacking submit.mc to fix my > > original problem. > > No, the only thing you need it fix is if you want to accept mail > on addresses other than 127.0.0.1 and sendmail's idea of your > hostname if it isn't what you want as a return address. But that's just it - I *don't* want to accept mail on addresses other than lo (127.0.0.1). On this machine, I get my mail from a "real" (i.e. Internet DNS-resolvable) server via POP3. I only want to send mail from this host > > > Also, check to make sure your host name really is what you think it > > > is, by typing > > > > > > $ hostname > > > > [jamoore@aria ~]$ hostname > > aria.cullmail.com > > > > I don't think it makes any difference to the receiving mail server > > whether or not aria.cullmail.com is an Internet-DNS-resolvable host... > > in any case, the connection will go through my firewall, and appear to > > come from that host. > > Most smtp receivers these days will not accept email if the > sender's domain is not DNS-resolvable. Some sites will also > refuse it if the IP and DNS don't match, but that is less > common (and the RFC's explicitly permit that case - otherwise > multihomed hosts wouldn't work). That's the problem - localhost.localdomain is not DNS-resolvable. The most confusing thing to me now is this: if I send a message as a normal user from the 'mail' command line, it gets delivered just fine; the From: line in the header reflects that the message is from 'localhost.localdomain', but the receiving mail server sees it as ultimately from my NAT'ing firewall (frwl.cullmail.com). However, if I send the message from the root account, it gets rejected by the destination host - the receiving host sees a From: header of 'localhost.localdomain'. Why is this? Why is mail from root handled differently than mail from a regular user? Thanks, Jay
