You should never open email from strangers.
Always look at the email. For example, I would immediately delete any email that comes from a
jeck@sau23.org . What kind of domain is this? Certainly he is not from a big company, neither an University or whatever.
Just use common sense and don't even open an email that comes from a weird email address
Weird or not weird, it does not matter at all. Just keep a key rule that Never open emails from strangers as you pointed out. Be careful with strangers, and stop immediately after looking at email addresses (if email addresses are strange, simply ignore).
Sometimes, we have emails from good strangers, with our works. So, ignoring all strangers emails can lead to missed chances. Personally, I use different emails; for my works and for my crypto stuffs. I think people should create and dedicate emails for their crypto exchanges, only. Nothing more than crypto exchanges. For their works, and their business, dedicate others emails for those stuffs.
Anyway, even when you use emails for works, to check emails from strangers, don't click on links and download anything attached.