Many web sites show email addresses as links, like this one: firstname.lastname@example.org. These are called "mailto" links, and their purpose is to allow you to click the email address and have it open a new email, addressed to that email address, using your default email program.
If you're using Chrome and you'd like to have those links launch in Gmail, follow these steps:
- Go to your Gmail inbox.
- Click the little double diamond icon on the right side of the address bar across the top. This will show a drop down like this:
- Select "Allow" and click "Done".
You can also set this behavior in other browsers: