SPAM SIGNIFICANCE OF THE IP ADDRESSES AND BLACKLISTING (IP's listed in the header) lottery scam example.
To check spam source the IP address "blacklisting" often informs if the IP is from a spammer or open relay hiding the true identity of the sender.
Using the aboutmyip website my recent spam was via 2 x IP addresses blacklisted with SpamHause, as a known spam source and includes IP address of illegal 3rd part exploits, spammer IP listed on SpamCop and SORBES spam -open SMPT relay server.
It is common for IP addresses to be blacklisted, usually dynamic IP addresses are but looking at the blacklist history can be informative to indicate how many listings exist if the email is spam and should be placed in the spam folder or filtered out manually.
This one was Detected as spam by virgin and tagged <spam> and is a regular spam email sender via unknown servers each time but spoofed as a gmail sender address.
May not be wise to open or forward spam emails- it will alert the spammer your email is valid.
Some spam is tagged <spam> by virgin, so this gives a warning, some spam may not be tagged so assume it may be spam if unknown or may be an unpaid bill notice from virgin media. Easy to verify by logging into the "genuine website" to check your account and not clicking on any links or images in a spoofed fake email which may bring up a fake website (phishing)
Check the headers in view source and the fake sender address will be shown
e.g.- "firstname.lastname@example.org" <email@example.com> (The header shows a spoofed sender address)
These precautions will help protect against dangerous emails.
If the email is known/genuine then it would be safe to open and read, and click allow images/remote content but only if trusted.
My latest safe method to deal with spam\scam\phishing is "not to read it" (not displayed) and just ensure it is in the spam folder, moving it if not tagged as spam or marking it as spam using the options in the email client or web mail. (it may be already in the spam folder if you set spam to go to the spam or junk folder using the isp spam settings and or email client spam settings)
Hopefully the spammers will stop sending if the emails are not read, I still get quite a few coming through.
I use the thunderbird email client which works with windows and has good security features as described.