When replying to a mail, the quoted original is preceded by a header similar to:
On 01/01/2020 12.00.00, “So-and-So” [email protected] wrote:
Or, in the case of a forwarded message, by:
From: “So-and-So” [email protected]
Date: —day, 01 January 2020 12.00.00
To: [email protected]
Subject: This is a Feature Improvement request
There is no such header when one resends a mail, but I think that it would be more than useful. Moreover, in my previous mail application, apart from the header, a script (possibly external, I cannot remember) provided for the insertion of the string [RESEND] in the Subject line, immediately following the message’s original subject.