When I changed my E-mail account, WordPress began sending me duplicate E-mails of my subscriptions as well as duplicates of some comments. This did not help my desire to simplify my life by getting all my blog activity into an E-mail account separate from my regular E-mails (you can throw in a few expletives at this point along with a temper tantrum).
It turns out that WordPress didn’t change over my blog subscriptions, they duplicated them. There truly were two sets of subscriptions out there. One was password protected and that was my actual WordPress account. The other one was not password protected and was merely a subscription manager that WordPress uses for a subscriber who is not part of WordPress.
When I changed my E-mail from Yahoo to Gmail, the Yahoo subscriptions were treated as a non-member subscriber. By clicking on the bottom of one of those E-mails, the subscription screen came up and I was unable to “unfollow”.
When I clicked on the bottom of the Gmail E-mail, it also came up with a subscription screen that had the same subscriptions. That I left alone as that was where I wanted my mail from.
It appears that responses to comments mostly switched over to Gmail. A few seem to be on my Yahoo account, but that is nearly run out. Those seem to mostly be older comments. I’m thinking I might not have been logged into WordPress when I made them and they are not part of my password protected WordPress account.
What a mess! I did put in a help ticket with WordPress, but they are backlogged right now and did not get around to it before I figured it out. It’s actually not difficult to correct but figuring out what was wrong took some persistence and detective work.