Mail no longer auto-updating

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http://forum.xda-developers.com – Been on Nil's Business Sense for months, no probs... Today, out of the blue, my email no longer is syncing. I have verified it is still set to check every 5 minutes, and it was fine yesterday (and I have not been tinkering for months). Even rebooted, then powered off and did a battery pull when that didn't work...no good. Mail only refreshes if I go into my mail folder now. Any ideas? (HowTos)