On Tue, 31 Aug 2004 14:14:10 -0500, Clay Niemann <clayn@xxxxxxx> wrote: > http://www.MSExchange.org/ > > Hi. My company recently implemented an Exchange 2003 server. Most messages > are sent and received fine. However, some messages to larger providers like > AOL and Yahoo get delayed for a couple of days then fail altogether. I have > verified that I am not on a SPAM blacklist. > > After looking around on Google I suspect the issue is related to reverse > DNS. The domain name that supports our LAN is fake (it isn't registered). We > do have a separate domain name for email that is registered. DNS hosted by > our ISP points the real domain to our Exchange server. They also configured > reverse DNS. We have an internal DNS server for hosts within our LAN. I suggest using your ISP's mailserver as a SmartHost, so that outbound email is relayed through your ISP's properly configured (RDNS, etc.) SMTP server. Run a test during non-peak hours, and configure your SMTP settings (In Exchange System Manager) -> SmartHost -> your ISP's smtp server. And send a few test messages. Yes, we could go more into depth about your DNS configuration, but I like to keep things simple. Either way, I am sure that we can help improve your mail delivery issues. ...D