I have an account that is not able to recieve mail from one of thier clients. I have watched the logs for mail and never see the message arrive at the server. The client can send out just fine to this client and I assume receives mail from all others as no other clients have contacted them about it. The client that emails the account of mine receives a message back in thier inbox saying "Your message has been delayed for some or all of the intended recipients." it then gives the recipents email address and says it will try to send the mail again in x hours x minutes. I have sent test messages from four accounts not located on the same server and from different areas around the country. I do have a firewall running but don't see any where in those logs about it being denied and I have disabled the firewall and had the client send a message and still nothing. Is this something on my server or is this something on the clients side?