Adding an Approved header with a mail client

Question

With older versions of Thunderbird I used to be able to add an Approved header to a message, but with later versions, even though I can get Approved to show up on the list of headers, when the message is sent the header is missing. I've tried rolling back to an old version, but Thunderbird keeps updating itself and I can't seem to stop it.

Is there some other (Windows or Web) mail client that has this ability, or a plugin to Outlook or one of the others?

Alternatively, can you tell me how to stop Thunderbird from auto-upgrading?

Thanks.

Michael

Answer 1

1. There is a free Set Field Value Outlook add-in than can set any header, including "Approved". I'm one of the developers of this add-in.
2. In Thunderbird, open Tools->Options->Advanced->Update and set the "Never check for updates" option.