On the ikiwiki preference page I added an e-mail subscription [[PageSpec|ikiwiki/pagespec]]. Now when I view the preference page the PageSpec field is empty, but I'm still getting e-mails. My guess at the cause of the problem is that I created an account using the e-mail login, then registered another account with a username. I think now when I login via either method I'm accessing the account with a username, while the e-mail only account has the PageSpec for the subscription. The e-mail notifications including a link to but they could include a login token so I can access the page and edit the PageSpec.