1. Since it's a catalog you should use a mailing service like Constant Contact which deals with mailing to thousands.
2. If you feel you don't want to use a mailing service, the script seller should be asked this question.
I bought a script of a catalog of organizations and firms, uploaded more than 2 million enterprises. During the activation of each organization, a notification went off.
As a result, the entire site hoster for spam cut down. Went to another. He completely disconnected the entire account.
Where can I find a normal host that does not block for mailing? Or maybe there are some other workarounds?
By the way, the newsletter also gets into spam, even when it comes to it. This is also not desirable.
In general, I am waiting for any practical advice on this issue.
Link to script removed by moderator.