Spam email-mailing commercial offers

You need a daily email newsletter of commercial offers. It is necessary to send on weekdays (5 days a week, 20 days a month) on 300-500 commercial offers. The base is downloaded from open sources, the base is provided, promotional materials too. We do nothing criminal and illegal, we provide services for legal entities. The task of making an effective mailing on a permanent basis, perhaps using non-standard approaches and "grey" schemes.