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Mail is better then slack in that it is non interrupting. It is good for usual stuff that can wait hours or few days and is neither bug not feature request. Which is quite common thing.

Slack is good for chat and quick discussion.

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Both suck when you actually want any structure or have to go back later to figure out what happened. You need to structure your communication more than free form text. For example, is that email a question? A suggestion? Maybe it's a reason this is all pointless. Search doesn't really fit the bill because it only really works if you know the proper words.

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