Hi,
I would suggest that you start by creating a new send connector to setup the connection to the ISP smarthost: -
On the Hub Transport server, open the Exchange Management Console. Expand Organization Configuration, click Hub Transport, and then, in the action pane, click New Send connector > Enter a name i.e. ISP Smarthost Send Connection
From the Select the intended use for this connector drop-down list, select Custom, and then click Next.
On the Address Space page, click Add. In the Add Address Space dialog box, type "*" for the name of the remote SMTP domain, and then click Next.
On the Network Settings page, only the Route all mail through the following smart hosts: setting can be selected. Click Add.
In the Add Smart Host dialog box, in the IP address or Fully qualified domain name (FQDN) field, type the IP address or FQDN of the external SMTP gateway server, and then click OK. To specify more than one SMTP gateway as a smart host, click Add and enter additional IP addresses or FQDNs, and then click Next.
On the Smart host security settings page, select Basic Authentication or Basic Authentication over TLS, type the user name and password that will be used to authenticate the connection, and then click Next.
On the Source Server page, click Add. In the Select Hub Transport and subscribed Edge Transport servers dialog box, select one or more Hub Transport servers in your organization, click OK, and then click Next.
On the New Connector page, click New, and then on the Completion page, click Finish.
Courtesy:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23255078.htmlRegards,
Faraz H. Khan
