You need to be asking this of whoever it is that provides the quarantine function. None of the messages you have quoted come directly from Thunderbird. What anti virus software do you use?

Mr. Goodmail provided the info. I thought it was connected to Mozilla or my server, but I don't know for sure.

I asume you have a mail-account on Mr Goodmail. You can see that you have mails in quarantine and when you open (or just view the list?) there is a link to View and another to Release. Right-click on View link and Copy link location Open your web-browser. With cursor in the address-field, right-click, "Paste and go"

If you want to move it into your inbox do the same with Release

This is an educated (?) guess as I don't use Goodmail

I don't know how to view the quarantine list. I don't know where it is.

The list is most certain on Goodmail's server as they perform that service.

How do you know they are quarantined? Don't you get some sort of notification / mail? If so isn't there a link in there?

If you log into Goodmail using webmail, is there a folder or a menu-link to quarantine?

A good mail e-mail tells me they are quarantined for 10 days. It says to copy and paste the "view" link. I do not really know how to do that, but I tried what I thought and got nothing. I probably have only a few more days before their system purges my e-mails.

The view -word can be a link

Right-click the link and see what it offers. At the least, it should let you copy the link and then you can paste it into your browser's address box.