The quickest way to find the SMS icon in your Apple Mail app is to search for it in the Settings app.
To open the Settings application, tap Mail in the menu bar at the top right of the screen.
Select Search from the list of options.
Scroll down to find out what your email icon is.
Once you find the icon, tap the icon to open the Options menu.
Tap on the icon you found and select Search.
Tap the Edit button in the bottom right corner of the window.
If you see a dropdown menu, select Add icon.
In the dialog box that appears, tap Add icon and enter your email address and password.
Click OK to close the Edit dialog box.
Now, in the Mail app, open your SMS inbox and tap the Mail icon in Notification Center.
To search for the SMSS icon, simply select the icon in Messages.
You can also search for your email inbox in Messages by going to My inbox and tapping the Mail menu.