How to avoid blocking for spam when sending notifications in the directory?

Question

Fight against spam

Bought [url= https://www.plati.market/itm/skript-katalog-organi... catalog of organizations and firms[/url], uploaded more than 2 million enterprises. During the activation of each organization, a notification went away.
As a result, the hoster cut down the entire site for spam. Went to another. He completely disabled the entire account.
Where can I find a normal hoster who doesn't block emails? Or maybe there are some other workarounds?
By the way, the mailing list also ends up in spam, even when it does. This is also not desirable.
In general, I look forward to any practical advice on this issue.

Answer 1

In general, guys, I tried a few more hosters. I must say the situation is similar. I tried to set up a mailbox with my domain with them, but I must admit that their technical support leaves much to be desired.
I stopped at wazzup.su , where mail is not blocked on KVM tariffs, and technical support quickly responds and helps to solve any problems.
The only thing is that in the first days I blew somewhere around 30 thousand letters a day and on the third day I noticed that my letters do not reach major mailers, including mail.ru, yandex, gmail and rambler. It reaches only mailboxes that are made on their domains, such as mysait.ru, and even then not to all.
Which, in general, also turned out to be not an option, since most of the recipients are users of these particular mail services.
As it turned out, the blocking is for spam by IP and the content of the letter. But thank God, the guys helped set up sending via smpt using the msmtprc utility, which, thanks to the hosters, also helped to install and configure.
According to mail.ru statistics, you can send no more than 1 letter per minute and block only on the way.
Yandex no more than 150 letters per day. So I had to register several mailboxes on gmail, he turned out to be the most loyal and sending at least 500 letters a day there.
Basically, I have registered 10 mailboxes on gmail and I'm sorting through them in order. So it leaves somewhere around 3-5 thousand letters a day.
Thank God the catalog developer has a paid module that allows you to make custom mailings. Well, I used more tags in templates to make the text more dynamic and shorten the text itself.
True, I had to disable the sending of letters through registration, and I already made the notification through the mailing module .
I also wanted to order a spam mailing list, but out of 2 million enterprises, I had more than 700 thousand with mail. And the cheapest mailing I found was $1 for 1000 messages. This is to send all 700 I need at least $ 700. I don't earn that much. And if you also consider that I will need to do it periodically, then you can completely go broke.
I tried a few more paid smpt servers, which seem to be not blocked. But they also do not protect against blocking by IP and there is no technical support there, but it costs several times more.
But in general, so far. If someone knows a server where such problems do not occur, then please be kind. Or at least how to make sure that IPs do not fall into the spam databases of Yandex, gmail, mail.ru and ramblera.

Answer 2

Where can I find a normal hoster who doesn't block emails? Or maybe there are some other workarounds?

1. Block everyone. But you can agree in advance with those. support for increasing limits.
2. Send not through the host. And through specialized mailing services. mailchimp type