[MM3-users] Include receipant address as a variable

I send out a monthly newsletter via MM. To keep traffic smaller the email has a link to the PDF of the newsletter. I need to somehow include a variable (the To: email) as part of the link. ie href = thewebsite/nl.pdf?tomjones@email.com That way I can tell A) who is reading the NL and B) popup a notice: Your membership dues have been paid through 2023.

Google hasn't been any help - although I'll keep searching. Thanks for any help