I found Dr. Web Link checker https://addons.mozilla.org/en-us/thunderbird/addon/drweb-anti-virus-link-checker/ is an add-on that will check emailed links. When I checked a few of the links in my friends bot-net hijacked emails, they tested OK…also tested OK in online link scanner…Since my friend had acknowledged the email hack and the emails are clearly from a bot-net, I find this a bit curious…troubling, if link scanners can’t detect attack links.