I SBF'd back to stock 2.3 and discovered I could get my corp emails to my device (sort of back door...but I get it)
I then ran the Verizon update, I assume that was the GB update. After which I could no longer get my corp email. They must have beefed up the security.
So....I'm running Squid...and still getting Corp email....are there any other roms I might try?