[Plugin: Post Notification] Subscribe and unsubscribe link not correct

The subscribe and unsubscribe link is not correct. This is what comes out in the e-mail sent to the subscriber:

?code=69494e5720a489dbc9481420c1cec927&addr=trialmail%40gmail.com&

I can imagine that something before the ? has to be there as well to make it all happen. I don’t know where to get it from

The plugin has worked in the past. I got the same problem in the past when people tried to subscribe but were not logged in. That’s not the case now.

I have removed the plugin and installed it again. Same problem. (When I had reinstalled the plugin again, all the data was still there, while I had put “Yes” at the remove data on the Tools page). I am using version 1.2.28