As a way of keeping myself safe while using any site, I made a rule of thumb not to open mails I ain't expecting. It's a huge red flag for me if a mail is even about promotions and giveaways.
Emails about upgrade of application, promotions and giveaways are not attractive with me. I can read them but I don't click on these links or immediately upgrade my application with that link.
The next step which is important I would like to do is visiting the official site and check announcements, news there. If an exchange for example has something big to announce, it will appear on its website where I can check and confirm the information I received in email.
It can be phishing emails that can easily be recognized by email addresses but even if email addresses looks official, not phishing, I still have need of confirm the information before taking my action accordingly.