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12bitfloat506554dUnless the service you are using gives you that option your pretty much all out of luck. If you are in the EU you might try sending a formal request to delete all your data but I think they are still allowed to keep it for a few months
C0D45669954dDoubtful, you could try PGP signing if your worried someone's going to read it.
I'm not sure if it deletes message from server or not. I think it should delete.
lanfiro49852dUse any of them but use OTR encryption.