I want to view my personal Gmail statistics.
- How many emails I am sending or receiving on average in one day/month/week?
- How many emails I am sending to a specific contact?
There is also the Account Activity, where you can see your entire Google monthly activity, including Gmail stats.
For example, my most recent Account Activity report told me that I sent 5 percent more email than the previous month and received 3 percent more.
Google Account Activity creates monthly reports on your usage of Google products. Depending on which products you use, you can see how many emails you've sent, who your most popular contacts are, what searches you've performed, or what computers you've used to sign in.
(Emphasis by me.)
If and when it is finally release, Xobni for Gmail promises to be an easier way of doing this.
Their Outlook version has all kinds of statistics in it.
mail-trends seems to correspond to what you want. You'll have to use Python and some other dependancies.
You can also try Gmail Stats.
I'll add other interesting graphs :)
Answering my own question:
Google has introduced GMail Meter
And more options, see the blog post for details.
You can use ruby-gmail if Ruby is your thing.