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@g right. Let's try this:

A, B and C are people with email addresses.

B has Gmail, A and C do not.

There are nine possible email messages: A to B, A to C, B to A, B to C, C to A, C to B, A to B and C, B to A and C, C to A and B.

Only 2/9 or about 22% don't go through Gmail.

"I see a lot of stuff come through Gmail" is reasonable, but it doesn't mean everybody uses Gmail.