I am upping my email sending per day, and have been using shared hosting accounts relaying the emails via SMTP, but I know this isn't the most efficient way to go about it. I am going to upgrade to a VPS or dedicated server, but am unclear on the cold cut pros/cons between the two. I am looking to send around 300k emails per day. Obviously you get more storage,bandwidth, etc with a dedicated, but I am debating the two just for pure sending purposes. Let's say I have Interspire installed on it, will it run significantly faster on a dedicated over a VPS? Also, let's assume that not all of my contacts are opted-in (if you know what I mean, haha) - bulletproofing 100% necessary? Thanks for the input everyone.