Whether you are trying to understand why a specific e-mail ended up
in SPAM/Junk for your daily Administrative duties or for your
Red-Team Phishing simulation purposes, this script is there for you
to help!

Idea arose while delivering a commercial Phishing Simulation
exercises against MS Office365 E5 estate, equipped with
MS Defender for Office365. As one can imagine, pretty tough security
stack to work with from a phishing-simulation perspective.
After digging manually through all these Office365 SMTP headers and
trying to cherry-pick these SCL values, time come to write up a
proper parser for SMTP headers.

Time went by, I was adding support for more and more SMTP headers -
and here we have it. Tool that now comprehends tens of different headers.