Sign in to your SKC email account
Click on the Google apps icon in the top right
Click on Groups
Look at the Subscription column for each email group
 

Under Subscription, choose an option:

• Each email—Messages sent individually as they're posted to the group.
• Digest—Up to 25 complete messages combined into single emails and sent daily.
• Abridged—Summaries of up to 150 messages combined into single emails and sent daily.
• No email—Messages from the group are not sent.