I can match all messages that I sent to someone@example.com but from what I see it won't display data size.

How do I know the number of bytes that I sent from my Gmail to someone@example.com ?


That's not something you can do from within Gmail. At best, you'll need to work out a way to export all of the messages to another location and use a different tool to sum up their sizes. Even then, that's only going to give you an approximation.

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