Barbara, > From: Barbara Miller <[EMAIL PROTECTED]> > Date: Tue, 13 Nov 2001 15:58:49 +0100 > > Hello, > > I'm running a small PC network, including an Exchange server, behind > an EigerStein using NAT. Most of the time everything works great.
We are doing the same, but using Postfix (which I can recommend) under Linux. I also follow the Postfix mailing list and have learnt a *lot* about mail servers there... > However, e-mail sent by the Exchange server to a few domains fails, > I understand, because there is no public reverse DNS for the > Exchange server, and some mail servers therefore suspect e-mail > coming from it is spam. Only the EigerStein router has a public IP. If mail is being rejected by a domain, send a mail to the [EMAIL PROTECTED] and ask him/her what you are doing wrong. Perhaps the failure notification from the remote server gives you a few clues. Be careful, I understand that Exchange "helpfully" massages the messages and alters the content, this may be a pain... Perhaps you could post one of the bounce messages so that we could study it? > In other words, e-mail from the Exchange server includes headers like > this... > > Received: from server.aac.edu (gw.aac.edu [195.113.149.145]) > by ... > > ... where server.aac.edu is the Exchange server, which has no external DNS > entry, and gw.aac.edu is the NATing EigerStein router with public IP > 195.113.149.145. I think that it unlikely that *that* is the problem. Mail servers rarely look at "received" lines. Things they do look at include: 1) The name your server gives when it says "HELO <myname>" or "EHLO <myname>". <Myname> should be the fully qualified DNS name of your server and some people check this (i.e. do a lookup of the name and see if matches the IP of your LEAF). Having said that, our server name (duif.hexapole.nl) doesn't resolve and I have never knowingly lost an email. The MX for hexapole.nl does resolve to the IP of our LEAF, so that *is* good. 2) More things that escape me at the moment ;-) > What do I need to do to make this failing e-mail go through? More information. The "bounce" message, info from the remote postmaster > Add DNS entries for server.aac.edu? Can I rename the Exchange > Server "gw" (since there's no gw.aac.edu on the internal network)? Niether would do any harm and could well do some good. Try it! > Thanks for your attention! > > Barbara Miller Greetings Mark Plowman _______________________________________________ Leaf-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user
