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This is fixed already in 3.3. It is a behavior change that could theoretically cause some problems. Currently, you can think of None as meaning "there was no timezone info at all", which is subtly different from -0000, which means "this time is UTC, but I don't know what timezone it originated from". These two tend to be conflated in practice (how else are you going to interpret a time with no timezone attached?), and since we are making other additions to email in 3.3 we decided it was a small enough change that it was OK for a dot release. But not for a maintenance release, just in case. (I'm open to argument on that, but these backward compatibility calls are notoriously hard to make.)