I couldn't find what you was requesting on Email from I.C.S nor Gingerbread But on Text Messaging the Default Message Limit for Both OS's is 200 but that Limit can be changed.. If any one knows were the Setting is that the OP is requesting it would be much appreciated to be Posted Here thanks b33 
Ann this is What i Found; it's on the Bionic But i don't know if the Feature has been pulled on recent OS builds or i'm just Not Digging enough to Find this Setting or looking in the Right Place. It says in the Instruction go to Accounts but in the App Drawer on my Razr's and my Droid X it's not there But my Accounts is. Now i did find Accounts in the Settings Menu but when i would tap on my Yahoo account it was just so that i could Change it. Not to do what is Listed down here Below
But i Remember seeing this Some Wear.. And i wanted to put it on here so you could see were it says this)
How do I customize my personal email settings?
If you would like to change account name, how long email is kept on the handset, account passwords, or server/port/security settings, follow steps below:
- Open Applications tray
- Tap Accounts
- Tap the email account your wish to edit
- Select General settings to change account name, reply name or email address
- Select Incoming / Outgoing server to adjust Server name, port #, username & password, and security settings
- Select Other Settings to modify how long handset will keep messages.
If you need to adjust email frequency, notification ringtones, text size:
- The settings you adjust in this application will affect ALL the accounts you have set-up in the Email application
. This includes Corporate Sync accounts but excludes your Gmail application accounts.
- Open Applications tray
- Tap on Email application
- Your Default email account will be displayed. (this is adjustable in email settings menu)
- Press Menu hard key
- Select Email settings:
- Tap Notifications to bring up Notifications option menu:
- Adjust notifications appearing in the status bar: Turn on (Checked) or turn off (Unchecked).
- Tap Select ringtone to change the ring tone for this account.
- Tap Vibrate to activate vibrate mode when you receive notifications from this email account.
- Tap Email delivery to change the frequency that emails is pulled to the device (Selections: Data push, Fetch schedule, or Folder sync.)
- Wi-Fi Settings includes Attachment download and Sync over Wi-Fi only (These options will manage how you recieve your attachments via a Wi-Fi connection)
- Tap Read options to change text size for your email account text (text sizes: 12,14,16,18,20)
- Clear search history will remove allthe searches you've performed and will no longer appear as search suggestions
- List view options gives you the Message preview to allow from (2,3, or 4 lines) and to enable/disable the Multi-select always on when you have several messages
- Tap Compose options to change font style & size for your email account text and signature
- Display suggestions will show suggestions while your addressing
- Tap Default Account to select account that is displayed and controlled when you select email application. You can adjust this to different account at any time. You will need to back out fully from the email application with the"Back" button and then re-open the email application to change the mailbox you are viewing.
- Tap Multiselect always on to enable you to select multiple emails within default account for various actions
- Manage address history stores address history which will show as suggestions when entering an address
- Out of office and Smart forwarding are new corporate email features to learn more, click here.
- When you adjust settings for the email application, the settings will apply to all accounts set-up through the application.
- For example, if you have 2 personal email accounts and a corporate sync account set-up on the phone and turn off Notifications in the settings menu, those changes will apply to all of your email accounts, including the corporate email account.
