You should perform a manual get mail after setting up a scheduled Auto Sync. Then, only new messages are retrieved during Auto Sync.
To receive notifications of successful Auto Sync retrievals only, uncheck the Alert me of auto sync failures box. Leave the box checked if you want to receive notifications of both successful and failed Auto Sync retrievals.
The Auto Sync feature does not work with all email accounts.
3.Select Delete on the Message menu.
4.If a confirmation dialog box appears, select OK to confirm deletion.
Deleting messages by date
You can quickly delete a group of messages by selecting a range of dates.
1.Open the menus 
.
2.Select Delete Old on the Message menu.
3.Select the folder and a date range for the messages you want to delete.
4.Select OK.
5.If a confirmation dialog box appears, select OK to confirm deletion.
Switching accounts
You can switch between different email accounts.
1.Open the menus 
.
2.Select Accounts, and then select an account.
Customizing your email settings
You can customize the VersaMail settings for each individual email account on your Treo smartphone. The preferences you set apply only to the email account you are currently viewing. If you have multiple accounts, configure each account separately.
You can set up a schedule to automatically retrieve email messages; set preferences for how and when messages are retrieved; add a signature to an outgoing message; and more. For complete information on all of the email settings you can customize, see the VersaMail User Guide on the CD.
Scheduling Auto Sync
You can set up VersaMail to automatically download new email messages to your phone with the Auto Sync feature.