Simply put, here are some tools for automating info from email headers and email body.

• Messageheader: https://toolbox.googleapps.com/apps/messageheader/analyzeheader

What can this tool tell from email headers ?

• Identify delivery delays.
• Identify approximate source of delay.
• Identify who may be responsible.

Another tool is called Message Header Analyzer. 

• Message Header Analyzer: https://mha.azurewebsites.net/

• Lastly, you can also use mailheader.org,  which will include info on Message Transfer Agent (MTA)

A Message Transfer Agent (MTA) is software that transfers emails between sender and recipient. Read more about MTAs here. Since we’re on the subject, read about MUAs (Mail User Agent) here. 

https://cyberchef.io

Cyberchef is good for when you are looking for something specific. For example you can use it to find all URLs in the email header and body

https://cyberchef.io