Mail server to use for sending Campaign/Marketing email SendMail Exim MailMan

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http://serverfault.com – I've been looking for a replacement mail server, I've been using a Communigate Pro server to send my mail, over time it's evolved and now not only sends my mail, but mail for several applications, it's sending about 750,000 - 1.5 Mill a week and was never setup to do this. I need to replace it, I don't have any experience with Exim or SendMail (But happy to learn) and initially I looked at the commercial SendMail Sentrion Product (C3E Core MTA) which looks like to be an ideal fit, anyway after picking myself up and recovering from the shock after finding out the cost, I've started looking ar (HowTos)