To enable Link Tracking, click the Yesware drop-down menu in the top left corner of Gmail. From there, select Preferences > Compose Options and Toggle On 'Track Links'.
You can verify that a link is going to be tracked by hovering over the hyperlinked URL or text and seeing that the destination includes "https://t.yesware.com/tl.....". When the recipient clicks on the link, it will go through Yesware very briefly (to capture the click) and then quickly redirect to the intended location.
As a best practice, we recommend naming your links rather than leaving them as a URL. This decreases the chances of your message being marked as spam.
Link tracking is available in Gmail as well as Outlook.