If you have a Twitter account, and get too many unwanted announcements, you can disable these in Settings > Email notifications.

Here’s a quick link to the page:

https://twitter.com/settings/notifications

Scroll to the bottom of the page and uncheck all boxes under the headings “Activity from your network” and “Updates from Twitter.” These are the least important of the updates.

You may also want to unselect some alerts and announcements in the other categories above.