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Comcast mail on Mac is downloading THOUSANDS of old messages!! Help!!

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Comcast mail on Mac is downloading THOUSANDS of old messages!! Help!!

Since last Thursday my Mac has been trying to download THOUSANDS of old emails.  My email is fine on my iphone and it's fine when I check it remotely from my Comcast account, it's just happening on my home computer.  Can anyone help?!  I don't know why it's happening.  I haven't been able to receive any new emails on my computer since 4/6, becuase it's continually trying to download up to 13K old emails (the number changes everytime I open my mail.)  I don't know what to do!  It's bogging the system down and now I'm getting messages that the startup disk is almost full.