How to disable Akismet for Jetpack Contact Form?

Question

I have Akismet and I use Jetpack Contact Form.

I found that Akismet sends any contact form message with a .ru email to the spam folder instead of sending it to my inbox. I tested this by disabling Akismet, and then I could receive the messages.

So if Akismet is blocking all .ru emails, then what else might it be blocking? I don't like that. Akismet works great for comments, but I don't want it filtering my contact form.

I want to disable Akismet for my Jetpack contact form (not for comments or anything else, just for the contact form).

I found this for doing it for Contact Form 7 - Akismet for comments only

And this for doing it for Gravity forms - https://gist.github.com/timersys/ef5f7c474b211bc70ba5

But how to disable it for Jetpack Contact Form?