TB version : 45.4.0 Account type : Pop3 Folder : InBox

I don't understand what you are asking about. Could you make a screenshot and highlight the parts you want to change?

https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem

Sorry, I'm french and sometime I have a difficulty to explain my problem correctly !

We know that each Email have his own date and own subject when I received ! I would like change a date for few Emails that received last week ....

Here an exemple (screenshot) of Email that you sent me yesterday with ellipse for date and subject:

Is it possible to modify date and/or subject (on red ellipse)of this Email received yesterday locate to my Inbox ?

Thanks

Finally I found this Addon able me to change Date, Subject, Body and others fields on existing Email !

https://addons.mozilla.org/fr/thunderbird/addon/header-tools-lite/

Here a screenshot :