I have never had any issues with the email sync up on my other android phone, so I assume that something is not write with the settings on my new Verizon S3. Basically, my phone does not synchronizes back with the yahoo nor google mail servers. For instance, when I walk my dogs in the morning I check my emails, and at the end I always press sync button to ensure that it syncs up with the server. However, when I come to work 40 minutes later both, my yahoo and my gmail still showing all the emails that I deleted 40 min ago. Why is that?