Here are the main points I found:

1. Opening a regular email does not pose any danger.

2. To identify an anonymous sender:

- Open the suspicious email.

- Look for clues such as misspelled words or incorrect grammar in the message body and subject line, which could indicate it was sent by someone who doesn't write English fluently.

This can sometimes reveal whether they're using a translation tool while writing their emails because these programs often leave behind small errors due known as 'tell-tails'.

- Check if there are any links included within the email itself; clicking on them may lead you straight back home (literally speaking!) since many spammers use fake link addresses that redirect users somewhere else entirely when clicked upon once more after first clickthrough rate has been met etcetera.

3. If method 1 fails, try using a tool like IP Logger or Whois lookup to trace the sender's IP address.

- Paste your email address into these websites and wait for someone who clicks on any links within it; then you'll receive their ip information along with other details such as country name etcetera depending upon what kind of data service provider they use.

4. If method 2 still doesn't work, try contacting the sender directly via another communication channel like social media or messaging apps to ask them who sent the email.

5. Remember that it's not always possible to identify an anonymous sender completely, especially if they've taken proper precautions such as using a VPN and/or proxy services.

Track email back to ip address