Hi,
Hope this finds you well; I am Adnan having a career spanning over 8 years of hands-on experience with digital marketing, software product management, and customer acquisition. I spent the last 7 years of my career with an email marketing focused company, having the main business is providing a solution for high volume email delivery.
We can set-up a solution based on market leader MTA application PowerMTA for you to send emails, with a fully-featured front-end email marketing platform for you to manage sending, will get a couple of IPs for rotation and sending domains also to configure PMTA with. We'll get the sending tested before we provide the solution for you, but if you relay emails that return with high bounce rate on Gmail, Hotmail especially, if these major inboxes find the content suspicious that you will relay, filters may get triggered. We can do whatever is in our range to ensure inbox but you certainly need to understand when you sending unsolicited emails, you'll need to compromise.
Let's discuss more on the possibilities, let me know the volume of emails you are looking to send each day, what is the portion of major inboxes (Gmail, Yahoo, Hotmail, and AOL) is in your list, and what type of campaigns will you be sending to the contacts.
I look forward to hearing back from your side
Regards.