In such cases, it’s best to err on the side of caution, because as it turns out, these Whats App emails are fraudulent.
With the personalized option provided by the folks at 33mail, you can have unlimited disposable addresses that end with @yourusername.33 In fact, you don’t even need to create it separately.
It’s created automatically the first time anybody tries to send you an email at that particular alias.
In future, if you receive unwanted emails from xyz.com, you can always block the alias associated with it.
33mail comes with a forever-free plan and an annual payment one.
When you do get those updates at a later date, you might discard them as spam without thinking twice.