How to find true email address of junk email

I received an junk email supposedly from "Gerber Life Partner" . However when I try to add that email as junk and to block sender, I get the message that it's not a valid email address. Is there a way to find the true email address ? Thanks.

You can block it by content or name or other things like contents depending on your app. The problem is these people will send from a false address every time so you cant block it YouTube

Samuria said:

You can block it by content or name or other things like contents depending on your app. The problem is these people will send from a false address every time so you cant block it YouTube

I am using Outlook as my email client. By using this link as a guide : How to Trace Emails Back to Their Source IP Address , I think I can find the original sender of that spam email.

If you hover your mouse pointer over email address it will show true address