We are running SBS2011 with Exchange 2010. We moved to AT&T U-verse from AT&T DSL. Before the switch, we were using a SmartHost with AT&T DSL to send messages. With the SmartHost, we did not have any issues sending to various domains or clients. After the switch, some messages are being rejected to some clients. The SmartHost had resolved this problem when we installed the new server several years ago. I contacted AT&T U-verse to get SmartHost settings for U-verse. I was told I could talk with Tech360 for a fee to see if they could help with the problem. I was told they may be able to help with the problem.
Port 25 has been opened but that did not resolve the problem. We found references to this in EE and on the web.
We are looking for information to configure a SmartHost for U-verse. Our inbound is working fine. Some of the outbound is being delivered but we need to resolve the undeliverables. Any assistnce will be appreciated.