If you are going to market via email you must learn the 'ropes'! The email server you are using (maybe your own vps or dedicated server or hosted server) -needs to have an SPF record, DKIM, Domain Keys - these are technical things that establish that the email is coming from a whitelisted server.
If you don't feel competent to establish all this - then farm it out to RentaCoder or somewhere else so your emails always land in the INBOX.
Times have changed from when every marketer could just chuck masses of emails into a mail server and get them to land in the inbox - it's likely with some to be deleted or thrown into the junk folder if the mail server you are using is not 'whitelisted'.
If using established mail services like Aweber or GetResponse - they are 'whitelisted' and pose no trouble getting your emails into the inbox for you - where they have a better chance of being read.
It always surprises me when marketers become 'guru's' and they turn to having their owner vps or dedicated server - their email delivery rate goes downhill!