I would like to know whether there is anyway of extracting and verifying the ip address of someone who has sent you an email.
Is this typically stored in an email's header / metadata?
If so, can this ip address adequately identify the ip address of the original sender? If the original sender was using a VPN, would the ip address in the email header and/or metadata accurately represent the sender?
The main reason I am asking is that I am receiving quite of lot of spam emails that are coming from different email addresses but containing the same phishing email. I am confident these are coming from the same source. If I block the ip address recorded in the email's header/meta data, would this be effective? Or would I be blocking some (innocent) VPN server somewhere overseas instead of the actual culprit?