I recently found this message in my mail inbox.
It looks like a spoof message to me.
It seems to come from Opera Security team at firstname.lastname@example.org
Please advise if this is genuine or a hoax
We're closing your Opera account unless you sign in
Dear Opera account owner,
We see that it has been a long time since you have signed in to your Opera account.
If you’d like to keep your account, please sign in before October 31st, 2016. Otherwise we’ll take this as a sign that you’d like us to delete your account.
We also wanted to let you know that on August 26th, 2016, we reset the password for all Opera accounts as a precautionary measure because we detected an attack on our servers. To sign in and regain access to your account, you will need to click “Forgot password” on the Opera account web page, and then follow instructions to create a new password. We take your data security very seriously and sincerely apologize for the inconvenience.
If you have already reset your password (after Aug 26th, 2016), you do not need to reset again.
Thank you for your cooperation,
The Opera sync team