Hi, I am wondering what kind of SMTP services you're using to send out BULK emails. The following have been found, but feel free to share your experience with them. Amazon SES - cheap SMTP solution; average inbox rate (some of their shared IPs have been blacklisted). They aren't very strict at monitoring their outgoing emails for spam. Mandrill APP - cheap as well; however their sending limits are based on your reputation. They are VERY strict in sending doubtful emails. MailJet - cheap, but also very strict on sending doubtful emails. MailGun - cheap and not strict in monitoring their outgoing emails. (just a recommendation: add a prepaid creditcard (for example: Entropay) to your account and you will be able to send 12000 emails for free. You will be charged for EACH month AFTER your email campaigns. I was able to send out 200k emails and removed my creditcard. I entered some fake personal details and they never billed me lol) Disadvantage: their shared IPs are very poor. Elastic Email - expensive, but not very strict in monitoring their outgoing emails. More to come!