To set up Microsoft Outlook Express:

1. Open Microsoft Outlook Express
2. Go to Tools > Accounts
3. Click the Mail tab to open a list of your mail accounts
4. Double click the account that has the problem
5. Click the Advanced tab
6. Change "Outgoing mail (SMTP)" from 25 to 26
7. Click OK and Close
8. You should be able to send mail

To set up Mozilla Thunderbird:

1. Open Mozilla Thunderbird.
2. Go to Tools > Account Settings
3. In the list on the left, select "Outgoing Server (SMTP)" at the bottom of the list
4. Select the account you need to change from the list on the right and click Edit
5. Change Port from 25 to 26
6. Click OK and OK
7. You should be able to send mail

To set up in Outlook 2003

1. In Microsoft Outlook, select Tools > E-mail Accounts
2. On the E-mail Accounts wizard window, select "View or change existing e-mail accounts" and click Next
3. Click the Mail tab and choose the account you need to modify
4. Click "More Settings"
5. Click the Advanced tab
6. Change "Outgoing server (SMTP)" from 25 to 26
7. Click OK, Next, and Finish