Tracing the history of an email chain : <p>I don't know if this is possible or not, so before i get too far down the rabbit hole I wanted to ask the community.</p>

<p>I have an email that was sent by person "a", to person "b", "c" and "d". 
This email was then forwarded from either b,c or d to a person "e"
Finally person e has replied to that email to person a, but has deleted the text in the email that shows who sent the email to person e.</p>

<p>I can see in the message header from person e, the "in-reply-to" message ID isnt the message ID of the original email from person a, and has an extra reference in the header which will be the email from the mystery recipient that forwarded this to person e.</p>

<p>The question is, is there any way or recovering or tracing who this unknown individual was?</p>
