Notes.app asks to verify a certificate each time I start it Every time I open Notes.app on El Capitan, I get a popup asking me to verify a certificate.

The certificate is about one of the websites I manage, but I don't get why it asks about it when I open such app...

I've tried marking the certificate as secure in the management panel but it still asks me about it each time.

How can I stop it?
Go to Systems Preferences > Internet Accounts select the account of the website you manage and disable the Notes.