|You might want to review the info found in this thread:|
Basically, the only 2 ways to determine if the text was changed would be to:
1 - Contact the original sender and view what was actually sent via their "Sent" log.
2 - Contact the owners of the severs along the path that the email took and compare what they "received" vs. what they "sent". Both versions of the email would be stored on their servers. However, gaining access to those files without some level of court order could prove to be troublesome.
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