Can I get a notification when an email arrives in a sub folder? I have a number of sub-folders set up on my work email with rules moving certain emails into these folders automatically.  On the Galaxy S3 I can see these folders, and can 'auto-sync' the folder, but how do I set it up so that I get a notification when a new email arrives into it?
There are many email apps for Android, each one should have an option within the app itself where you can check or uncheck to be notified of a new email arrival.
This list covers the most popular ones:
Email
Allows you to have a notification on the status bar, when activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;Account Settings&quot;;
Scroll your way to &quot;Notification settings&quot;;
Tick the checkbox for &quot;Email notifications&quot;.

Gmail
Allows you to have a notification on the status bar for each one of the configured accounts. Can be activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;more&quot;;
Tap &quot;Settings&quot;;
Tap over the desired account;
Scroll your way to &quot;Notification settings&quot;;
Tick the checkbox for &quot;Email notifications&quot;.

K-9 Mail
Allows you to have a notification on the status bar for each one of the configured accounts. Can be activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;more&quot;;
Tap &quot;Accounts&quot;;
Long Tap over the desired account;
From the popup, tap &quot;Account settings&quot;;
Scroll your way to &quot;Notifications&quot; and tap it;
Tick the checkbox for &quot;New mail notifications&quot;.

MailDroid
Allows you to have a notification on the status bar, when activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;Preferences&quot;;
Scroll your way to &quot;Notifications&quot; and tap it;
Select the icon for the status bar from the dropdown;
Tick the checkbox for &quot;Show separate notification&quot;, aditionally you can tick the checkbox for &quot;show once&quot;;

Yahoo! Mail
Allows you to have a notification on the status bar for each one of the configured accounts. Can be activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;Options&quot;;
Tap the desirable account;
Tap &quot;Notification Settings&quot;;
Tick the checkbox for &quot;Show in Status Bar&quot;.

Hotmail
Allows you to have a notification on the status bar, when activated within the application:

Access the application;
Tap your device &quot;home&quot; button;
Tap &quot;Account Settings&quot;;
Scroll your way to &quot;General Settings&quot; and tap it;
Scroll your way to &quot;Notifications and Alerts&quot; and tap it;
Tap &quot;Email Notifications&quot;;
Tick the checkbox for &quot;Message Notification&quot;.


Notes:

Some Email apps, in order to notify you of the arrival of new mail, need to have the &quot;auto-sync&quot; and the &quot;Background Data&quot; active on your phone settings:
This options are found on your device settings, under &quot;Accounts &amp; sync&quot;.

&quot;Tick the checkbox&quot; stands for having the checkbox with a green tick on it. The gray tick is the disable status.

If your email app isn't present on the above list, feel free to @Zuul me and I'll be glad to add it to the list.

Only email app with Notification capabilities will be present.