Hello and thanks for your reply.
First off, a suggestion: if plugin doesn’t allow to change (un)subscription links, perhaps you might consider not showing them in an editable box. It’s misleading for the user, who thinks (like me) it can be edited and then wonders why he can’t.
The reason why I wanted to change the links is related with the error itself. I’ll try to explain:
As said, when clicking the link in the subscription confirmation mail, I get the aforementioned error. The link’s URL is of the form https://freelander.es/whatever-else.
If, instead of simply clicking on it, I copy/paste the URL to my browser’s address bar and, before submitting, edit it so as to include the language subdomain (for instance https://en.freelander.es/whatever-else), then everything works fine.
Therefore, if I could modify the link’s URL structure in the settings (for including the language subdomain), everything would work fine. But the plugin doesn’t allow.
As to steps to reproduce, I suppose you’d need a multilingual blog set up the way mine is: language by subdomain. WordPress 3.9. Then install your plugin and just try to subscribe to it “from outside”, as a reader.
In any case, I’ve finally opted for updating to WP 4.2, and now the plugin works fine. But the bug is still there, of course, for WP 3.9 users.
