Edit: I should add that I did receive an email now, after having logged in, changed my password, and logged out and in again.

As far as I know, there is no need to change the password. You just have to log in, to reset the expiration date.

That is well possible. What I am saying is that
- people who want to reset the expiration date need to log in
- people who want to log in need to know their password
- people who don't know their current password (which is likely after 3 years of inactivity) need to reset it
- the latter is not possible if you don't receive that email.

By the way, I did not receive any notification about your reply to my post despite having signed up for that.

TLDR: I believe email sending has problems in this forum instance.