Sometimes you just want to sync quickly (eg. over GPRS) and one big, fat and unexpected 10MB email is coming without you knowing and without a way to skip it. So please improve this dialog, so you can see if you have a bottleneck and give an option to skip the email.

Figure: My UI suggestion would be to show the top 5 emails in size (sorted descending) with a button on each row “Skip for now”