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Need to change SMTP info in Exchange 2007

One of my customers has been down due to a failure from their ISP. They are trying to use one of the Mobile Internet USB sticks to try and limp along until the ISP can get their service restored.
I am very much a newbe when it comes to Exchange 2007. We have disabled the MX record from their website. Where would I go in Exchange 2007 to set a specific SMTP route to see if we could send emails through this USB Mobile Internet unit?
3 Solutions
Sending could work if you use for smarthost USB mobile internet ISP SMTP server.
http://msexchangeteam.com/archive/2006/11/17/431555.aspx (look at send connector)
Receiving mail would not be so simple. USB mobile internet are normally using NAT.

To receive emails from Internet we need Public IP address. If you manage to get public ip address for the USB mobile internet then you can configure MX record to the Public IP address to receive emails

What is Exchage setup you have, you have Edge server or Hub is sending email to Internet
Which machine as USB Internet configured?

Glen KnightCommented:
If your only interested in sending then you can update the send connector located under organisation configururation > Hub transport > Send Connectors look at the properties of this and send it to the SMTP Smartrelay provided by the ISP, however I would be suprised if they will give you access to do this.

As the mobile device will have a dynamic IP address you will have to send via a relay or your mail will be rejected by a large amount of companies.

If you want to receive as well then you will have to setup a service with www.dyndns.com so that your MX record is updated with your IP address when it changes.

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