Instead of creating two SMTP connectors with the same address space and bridgehead (but different smart host), try creating a single connector with multiple smart hosts. You can do this by either of two ways. You can use Domain Name System (DNS) in a round-robin configuration. Or, you can enter the smart hosts' names separated by commas in the
Forward all mail through this connector to the following smart hosts option on the
General tab of the
SMTP Connector Properties page. You can use the NetBIOS name, a fully-qualified domain name (FQDN), IP address, or any combination thereof. Some examples include:
Example A: By NetBIOS Name
server1,server2,server3
Example B: By FQDN
host1.domain.com,host2.domain,com,host3.domain.com
Example C: By IP Address
[192.168.0.1],[192.168.0.2],[192.168.0.3]
When sending to smart hosts separated with commas, if those smart hosts are represented by IP addresses contained in square brackets (which is done to bypass name resolution), as in Example C, instead of the DNS name, you may experience problems if you are running an Exchange 2000 Server version that is earlier than Exchange 2000 Server Service Pack 1 (SP1) with the round robin load balancing. Instead, what will happen is that the connector will only use the first server in the list. To work around that issue you can enter the smart host in the round robin by either host name or by FQDN.