My Yahoo account is: ktsib@yahoo.com

All Yahoo Calendar email reminders are incorrectly sent to my old address:

ktsibouk@panafon.gr

I have verified the following:

• Calendar Options → Reminders shows the correct address: ktsib@yahoo.com
• The old panafon.gr address does not appear in Calendar settings or Sharing.
• Mail → Settings → Mailboxes contains only my current Yahoo mailbox.
• Account Security → Additional emails does not contain the panafon.gr address.
• Disabling Email reminders, saving, and enabling them again did not fix the problem.
• The problem occurs with completely NEW events.
• I created a completely NEW TEST calendar and a NEW event in it. Its reminder was also sent to the obsolete panafon.gr address.

The raw message header confirms that Yahoo Calendar itself is explicitly addressing the reminder to the obsolete address:

From: Yahoo reminder ktsib@yahoo.com
To: ktsibouk@panafon.gr
X-Mailer: WebService/1.1.26086 mail.backend.jedi.deli.acl:role.jedi.acl.token.atz.deli.calendartriggergcp.yahoo

Therefore, this is not email forwarding and does not appear to be related to an individual calendar or event.

It appears that ktsibouk@panafon.gr is stored as a legacy Calendar notification/reminder address in the Yahoo account backend, but this address is no longer exposed anywhere in the current Yahoo user interface.

Please investigate the backend account data, remove the obsolete ktsibouk@panafon.gr Calendar reminder address, and make Yahoo Calendar use my current address ktsib@yahoo.com for email reminders.