Hello, forgive me if this has been addressed already. I recently bought a refurb 2011 11" MBA from Apple and, after three months of usage, the fan rarely--if ever--kicked on. That is, until, I started using Mail. Now that I began using mail and downloaded thousands and thousands of emails, the fan runs near constantly. Is this normal? How can I alleviate this? Also, I should note that I am using it in clamshell mode. I'm not sure if this matters. Thanks for any help.