What app are you using? I was able to add my Gapps email account to Gmail, K9 and Maildroid.

Are you setting up imap? Make sure to use the FULL email (not just username) for sign-in.

 

I have a google apps account as well. Click on the instructions below.

https://mail.google.com/support/bin/answer.py?answer=114408

I can receive and send email. The only problem now on DL30, the standard email client only downloads the headers. When you click on the link, it says Unable to load message. Message to long. K9 works just fine though.

 

One other think I've found: on Samsung phones, somethimes there are both 'mail' and 'gmail' apps - use the gmail app if you put your google account on the phone.

Also, if you use google voice for your voicemail, download and install google voice and use it instead of the Samsung app.

I just had to do this for a friend last week.