Good morning, I'm having a problem with my SMTP server installed on W2k3 server. Before we used SMTP of our ISP but because messages were delayed by few hours on regular basis I decided to install SMTP server (Exchange server installation is busted and will have to reinstall the server to get it work). For now I have a problem with one address which is working from my ISP's SMTP server but not from my server. I have setup my ISP's DNS servers and there isn't problem with other recipients, only this one. I tried to check the domain record for that email and it was OK. I checked via MX record database what servers they are using and the servers were fine as well. I got this response: Final-Recipient: rfc822; Action: failed Status: 4.4.7 Is there any way how to check it or can you tell me what could be the problem? The domain is boomerangaustralia.com. Thanks Juraj