After setting your Windows Mobile device to send and receive e-mail you may find your smartphone can receive messages just fine, but sending e-mail is another matter entirely.

Sometimes this happens because, for one reason or another, your ISP's (Internet Server Provider) send-mail server won't work over your carrier's network. So one thing you can try to circumvent this problem is to replace the server listed in your on-device Outgoing Mail preference area with your mobile operator's send-mail server.

So, for example, if your EarthLink outgoing e-mail server (smtpauth.earthlink.net) isn't doing it for you, then try replacing it with your operator’s: If your carrier is Cingular (AT&T), for instance, then with cwmx.com. I've tried this out with a Treo 750 and the solution worked fine.

For convenience sake, Palm provides a compressive list of ISP incoming and outgoing e-mail servers and details about some operator send-mail servers here. If your carrier isn't listed contact it directly for this information.

Here's how we changed the Outgoing Mail preferences on the Windows Mobile-based Treo 750 (the directions should be - if not the same - then similar with other Windows Mobile handsets):

1-From the Start menu select Inbox

2-Select Menu on bottom right of screen

3-From the dropdown menu that appears select tools

4-Then select options from the next menu that comes up

5-The options screen shows all the e-mail accounts you have setup with your device. It is also where you can add a new account.

6-Select the account you're having trouble with and want to change the outgoing server

7-Click next 3x until you get to the Server Information Screen

8-Delete the server listed under Outgoing Mail: and replace it with the send-mail server of your carrier.

9-Hit Finnish

Here Microsoft offers directions on how to setup wireless e-mail on your Windows Mobile Pocket PC or Smartphone. An e-mail setup wizard walks you through a series of steps that will lead to customized directions for your specific Windows Mobile Pocket PC or smartphone.

You input your e-mail address, country of mobile operator, specific wireless carrier, operating system (e.g. Pocket PC Windows Mobile 5.0, 2003 Second Edition and 2003 or Smartphone Windows Mobile 5.0, 2003 Second Edition and 2003.

Here's a simple way to tell if your Windows Mobile device is a Pocket PC or Smamrtphone: If it has a touch screen its a Pocket PC, if not then a Smartphone.