I think the reverse dns only needs to point to a host record - not aware of any requirement that it contains the sending domain. You might want to ensure your MX for domainb points to the correct host.
________________________________ From: Jonathan Gruber [mailto:[EMAIL PROTECTED] Sent: Friday, May 23, 2008 8:20 AM To: MS-Exchange Admin Issues Subject: Hosting Multiple domains in Exchange 2003 We are currently hosting multiple domains on an exchange 2003 box and have run into an issue. We set up the box using domain a, and the fqdn listed in the virtual smtp server is mail.domaina.com. A user has sent an email to a bellsouth account using domainb which is also hosted on this server and the mail is timing out. When a test is sent from domain to the bellsouth.net address it goes through, so I assume that the reverse dns lookup bellsouth is doing is failing. My question is, what is the best way to resolve this, multiple virtual servers, configure external dns servers? I haven't had an issue sending mail to any other domains except bellsouth.net. Jonathan Gruber Network Administrator J.B. Long Inc. 610-944-8840 x.213 484-637-1978 direct ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
