Install Change quote and reply format and enable 'Extended reply header' and 'Insert the CC field...' in the add-on options.

http://chrisramsden.vfast.co.uk/3_How_to_install_Add-ons_in_Thunderbird.html

Tested and working here in TB 24.5.

Could you try to edit the question information as you have displayed personal information such as email addresses. This is a google searchable webpage and so the whole world, including spammers can see the email addresses.

If you use Reply or Reply all the info you describe is not inserted because the person(s) receiving it already know their own email address as they sent the email in the first place.

If you use Forward then you are sending the info to another person. They of course will not have received any email, so will not know who has received it, hence the inclusion of email addresses.

So it is all logical.

i'll have a look to see what if anything can be changed.

I already knew why it doesn't display what I want it to; but I do want to know if it can be changed. I am not worried about the emails showing; all of them are emails at a public university and could be found by anyone in the world from our university web site.

Try this addon:

• https://nic-nac-project.org/~kaosmos/changequote-en.html