Depending on how fast you were going relative to the speed limit you may not get a follow up mailing.

For example, I got tagged for 124 kph in a 100 kph zone (the electronic sign was turned on) on the A3 just outside of Cologne a couple years ago. I never got a follow up mail and I went back to Germany 3 months later.

That being said, it's a good idea to memorize speed limits for any country you're visiting. For example residential speed limits in California (and the rest of the US) is 25 mph, but it's not posted anywhere and California's unposted speed limit is 65 mph for the freeways and 55 for rural roads. In Germany it's 50 kph for cities, 100 kph for rural, and 130 kph recommended for motorways. Audi's in Germany are useful for this because they have little tick marks next to those speeds on the speedometer.