E.ON "You've got mail" spam

I haven't used E.ON for a couple of years, and I no longer have an account with them. So I was surprised to get this E.ON-themed spam. Is it malware? No, it really is E.ON spamming me..

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From:    E.ON Energy [eon@eonenergy.com]
Reply-To:    "E.ON Energy" [eon@eonenergy.com]
Date:    17 September 2015 at 19:02
Subject:    You've got mail

You've got mail. If you are having trouble viewing this email, you can view it here.

You've got mail Dear Conrad Longmore Thanks for letting us know you'd like us to send you information by email. What does this mean for me? You'll receive contact from us by email instead of through the post. We're introducing our emails gradually, so you'll still get a few things through the post until we're all up and running. What kind of things will you send me? We'll only send you important information that you need to know about your account, including: Changes to Direct Debit payments, if you've chosen to pay this way. Asking for meter readings Reminding you about any appointments you have  with us. Reminding you about paying for the energy you've used, if you haven't already told us when you're going to pay. Anything else we think you'll need to know about your service from us. Don't worry, we won't send you information to sell you anything, unless you've already told us we can. What if I change my mind? Visit our website and let us know. If you change your mind, we'll still send you reminders by email if you've not paid us what you owe. As you're an online customer, we'll also still send you an email when your bill is ready to view and other emails related to your online account you automatically get when you've signed up online. If you've got questions about your account or anything else, click here. You won't get through to us by replying to this email. Yours sincerely E.ON Customer Services

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	Disclaimer Notice This email has been sent by E.ON Energy Solutions Limited. While we have checked this email and any attachments for viruses, we cannot guarantee that they are virus-free. You must therefore take full responsibility for virus checking. This message and attachments are confidential and should only be read by those to whom they are addressed. If you are not the intended recipient, please contact us, delete the message from your computer and destroy any copies. Any distribution or copying without prior permission is prohibited. Internet communications are not always secure and therefore E.ON does not accept legal responsibility for this message. The recipient is responsible for verifying its authenticity before acting on the contents. Any views or opinions presented are solely those of the author and do not necessarily represent those of E.ON. Registered Address E.ON Energy Solutions Limited. Registered office: Westwood Way, Westwood Business Park, Coventry, CV4 8LG. Registered in England and Wales No. 3407430. CONSENT CSS

Ooookay. So it's a phish or malware, right? Well, in this case floating over the links clearly shows an eonenergy.com domain, rather than something malicious. And at least E.ON have shown good practice by using their own domain rather than some random tracking domain that others do.

It's been a long time since I logged onto E.ON because these days I generate all my electricity from a secondhand Russian nuclear reactor plucked from a rusty submarine that I have buried under the lawn.

Logging on to my account gives this message..

And from that point onwards there is nothing at all that I can do. I can't turn off the E.ON spam because I don't have an account with them!

It's probably 15 years or so since I registered on E.ON.. when I registered it was part of TXU, then PowerGen which then became E.ON. So if you have registered an account with any of those companies in the past decade and a half, then you might get this spam from E.ON, even if you closed your account a long time ago..

UPDATE:
E.ON have posted some information about the cock-up and an apology here.