How to deal with spam from fake sites

Question

Network administration

Hello.
There is a more than well-known resource, let's call it Portal1, the resource is five years old, stable 40k-50k users visit it per day.
It so happened that he has no competitors, in connection with which shkolota is not really trying to become competitors.
I don't mind competition as long as shkolota doesn't start spamming.

One of these school resources, let's call it Nedoportal, collected soap on Portal1, from ads, someone left it somewhere on the forum, wrote in the profile, it doesn't matter. I collected a database of soaps and sends mailing lists to them.
The final letter looked like this:

In the attached file, congratulations on the Day of workers of *** and *** industry from *** portal (Nedoportal) ***

In order to unsubscribe from this mailing list, follow the following link: http://***.ru/ auth/s-reg-new.php

+ a picture of 0.5 megabytes
+ a Word file with a description of what a cool portal it is (Nedoportal) congratulated on the day *** and asked to register there.
This Nedoportal itself is a very specific shit site that was made for a thematic real paper magazine.

Naturally, I opened the properties of the letter, looked at whois, spam is sent directly from the site of the Underportal.
I write to the hoster, attach RFC headers and other things that are required there, to which I get a response:

The letter you sent contains the line: "To unsubscribe from this mailing list, follow the following link:", the recipient can exclude himself from the mailing list using the link provided.
That allows not to consider these letters as spam.
If the recipient does not want to receive such emails from ***.ru, all he has to do is use this link.

You can discuss other questions with the administration of the site ***.ru.

Gentlemen, maybe I'm really wrong? Or is the hoster covering the spammer?
Neither I nor any of the other victims subscribed to the mailing list from Nedoportal ***.ru, is it the unsubscribe link, which is far from the fact that unsubscribing makes a legitimate letter out of unauthorized mailing?

Answer 1

Everything is correct. If there is an unsubscribe link, then it cannot be considered spam but!!! All mailing services say as one: we do mailings ONLY if you have a database of emails collected by confirming the checkbox for the mailing list by the user, despite the fact that the default checkbox should be unchecked. Everything else is prohibited for service. Emails collected in any other way are prohibited. Because they send it through their. There is a complicated story here.
Pay the hoster's attention to the fact that the collected emails from your portal cannot unsubscribe (well, who will check it in the hosting support? Besides, I deeply doubt that they really unsubscribe something from this link) And tell them that the letters continue to go. Let's see the reaction.
On the other hand, how did you know that emails from your portal are being sent out?

Answer 2

Send abuse to all sorts of spam cops and spam houses, you can get gmail to spam them by IP address despite the unsubscribe link.

Answer 3

Have you tried to write not to the hoster but to the domain registrar?

Answer 4

And it is impossible to choose a separate mailer at least based on Exchange. With competent settings, you can very cool clear SPAM ANTISPAM