Instant Bulk SMTP is the best bulk email marketing company in the world. Offers a reliable, fast and quality Email Marketing Service. By looking at the way marketing is playing an important role Instant bulk SMTP was designed in order to start sending campaign easily. Unlike other email marketing  services Instant bulk SMTP is provided with high volume hosting service not only from own (user) application server, email client could also be a combination of different sources. They are providing high volume services.
Below are the attributes of InstantBulk SMTP
Instant bulk SMTP uses multiple IP’s in order to send emails with more speed.
Unlimited email to unlimited subscribers.
Simple Integration with your application.
Free Mailing Software (Optional).
Free support 24/7.
No long term contracts.
Setup RDNS, SPF, Domain Keys yourself.
Instant Bulk SMTP is discernibly less expensive than other SMTP specialist co-ops which offer a few designs dependent on email sending limits…
http://www.instantbulksmtp.com/dedicated-servers/