Unfortunately, you cannot use IMAP/POP e-mail clients to connect to @my.gavilan.edu. Although Gavilan does not support mobile devices/apps, there is a way to connect iPhones/Androids using the Gmail app. You cannot use the built-in Mail app on either iPhone/Android.

You must download the GMail App for your device. 
Once installed, open up the application. Then follow the steps below.

Apple Store Gmail App Download   Google Play Gmail App Download

  1. Sign in with your Gavilan e-mail address (e.g., rocky.ram@my.gavilan.edu)
  2. Do not enter anything into the Password field
  3. Click the "Sign In" button
  1. You will be redirected to the myGav portal login page
  2. Log in using your G00# and PIN
  3. You should get redirected back to the Gmail App, and have access to your @my.gavilan.edu

Gmail Sign In Screen Shot on iOS device 

myGav Sign In Screen Shot