I have around 5 million payday/subprime emails coming in a month and basically wondering what a good way to send these would be. I already have an smtp server with DKIM, rDNS, SPF and all setup. I get a 10/10 on mail-tester.com and avoid spam keywords. I also scrub my list to try and get rid of bounced emails. I only get inboxed at the beginning and it seems like I need to be one the whitelist to get inboxed regularly. Anybody have any tips for getting a good inbox rate with these type of offers? I'm currently using 1-2 images per 500 words of text or so and a dedicated SMTP with 6 IP's sending only to 40k emails(for testing) and only 500 mails max per hour.