Block spam when sending notifications to the catalog.

I've purchased the script from the catalog of organizations and companies, downloaded more than 2 million companies. Upon activation of each organization, a notification was issued.
As a result, the site host for spam has been reduced. I went to another. He completely disconnected the entire account.
Where can I find a normal host that does not block the sending of mail? Or maybe there are other workarounds?
By the way, the newsletter also goes into spam even when it needs to be. This is not either …

Block spam when sending notifications to the catalog.