Unable to send mail using iTouch

I would try reconfiguring your e-mail setting. Here is how you do it:

Set Up an Email Account to Use on an IPod Touch

• Set up your iPod touch to sync by attaching the wide end of the USB cable into the dock at the bottom of your iPod. Insert the smaller end into a USB port on your computer. The keyboard ports on a desktop computer do not have enough power to sustain syncing, so use one of the ports on the computer itself.
• Open iTunes and wait for your iPod to be recognized. Go to the "Info" tab at the top of the summary screen that appears.
• Choose the type of email account you want to sync from the list of options. Refer to your iPod touch user manual to find out which mail programs are compatible with your iPod. Click on "Sync."
• Get a free email account to use with your iPod touch if you do not have an email account through your Internet Service Provide (ISP). Both Yahoo! and Google Mail (Gmail) offer free email accounts that can be used with the iPod touch (see Resources below). Go to "Settings," "Mail" and "Account" to add an email address from Yahoo! or Gmail directly to your iPod touch.

• Tap the "Mail" icon on the home screen of your iPod. When you have unread mail in your inbox, the number of messages will display in a red circle at the top of the icon.
• Touch the inbox or other mailboxes that you may have set up to see the unread messages. Each unread message will have a blue dot next to it.
• Read a message by tapping on the subject line. The full message will then appear on your screen. To read another email, you can touch the up and down arrows or you can go back to the inbox to select another email.
• View photo, video, word processing and spreadsheet attachments by downloading them to your iPod touch. Tap the attachment to open it. When it has finished downloading, you will be able to see it on the screen.
• Reply to an email that you have been sent by tapping the "Reply" icon (it looks like a backward arrow) when you are viewing the message.
• Send a new email by tapping the icon that looks like a pencil and paper. Use the keyboard to enter in the recipient's email address or choose an address from your contact list. Type the text of your message and touch "Send."
• Check for new messages in your inbox by tapping the "Refresh" button. This is an icon that looks like a circular-shaped arrow.
• Delete an email by touching it and then touching the trash can icon.