zmtlsctl is what you're looking for.
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thanks for getting this upgrade script out to us; before i go with it, i have a few questions.
1. is it specific to the Open Source version, or will it work for M1->M2/Network
2. we have confirmed success with this, right?
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Also, a feature suggestion, something like POPFile, bayesian automatic classification (or suggestion) of "categories" for incoming mail. Something like, "Zimbra thinks this mail should be marked as School/Friends". Something else to differentiate you. Kinda.
