If you're tracking a user in the EU, you need consent. The GDPR doesn't cover the 'how' -- just that it needs to be done. So, if there's tracking of any kind, you'll need consent.
Applies off site as well -- pretty much every cold email tracking software, like Yesware, is in violation of GDPR, since you didn't get the recipient's consent to track their opens and clicks.
Applies off site as well -- pretty much every cold email tracking software, like Yesware, is in violation of GDPR, since you didn't get the recipient's consent to track their opens and clicks.