Everyone in the Internet Marketing world says that money is in the list. This is totally true if you provide quality content that your subscribers are looking for and don’t spam them with every offer under the sun.
Though sometimes, even when being the most ethical marketer, you my suffer from people taking advantage of the system.
Let me explain: when using a Big autoresponder company, you share their server and IPs with tons of people sending emails automatically. If the IP gets black listed or get a bad reputation because of one of these bad people you will be penalized as well and may loose a big part of your business.
This is exactly what happened to Brett Rutecky. He went through this painful experience and had to figure out how to come back to business without relying on 3rd party company. This is why he built his own email sending WordPress plugin and tested it successfully for several months.