We keep getting errors sending to some domains. The server is small buisness useing exchange 2k3, and they are running DNS that I verified works with reverse lookup via DNSstuff.com. I created a connector through their ISP and put the domains in there anyway, but no change. The messages returned looks like Reporting-MTA: dns;smtp1.XXXXXXX.com Final-Recipient: rfc822;xxxxx@xxxxxxx.netAction: delayedStatus: 4.4.7Will-Retry-Until: Wed, 23 May 2007 11:31:21 -0400X-Display-Name: xxxxxx@xxxxxxx.net The domains can send to us fine, and we have verified that we can send to them viaYahoo or MSN accounts. We only cannot send to some domains. Any ideas?

Hello, was there any update on this? I'm stuck with the same bounce-back message.