Both – neither the links in old newsletters nor the links in the new newsletter are working after the last MailPoet update. They work in the browser (archive) view but after sending the newsletter something went wrong with the links. Apparently adding the tracking ids to the URLs render them nonfunctional so the subscribers of the newsletter get dead links.
I duplicated an old newsletter and sent it to me – the same problem.
I’m installing MailPoet on a clean WP installation to check if the dead links problem can be reproduced.
Best,
Frank