Currently Being ModeratedAug 1, 2013 10:18 AM (in response to Megs78)
I am having this problem too. Have you been able to solve this issue?
Currently Being ModeratedAug 2, 2013 2:31 PM (in response to Mwandi)
Same here... Apple Mail downloaded 105GB in my case. Thank god I just switched ISPs with a more lenient bandwidth policy, or else I would be out 100+ dollars!
I fixed it by restarting Apple Mail.