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"swamped ... now" might be an understatement. From the looks of their support page (https://sparrowmail.tenderapp.com/discussions/questions) - the last reply actually made by sparrow support was on December 8.

Their support forum is kinda weird. Every time I add a question it ends up as private. I assume that is why there is a lack of public activity there.

As I understand it, the answers are marked as public once an actual answer is reached.