Hello,
I'm bulk e-mail sending system provider and server configure expert. You can check my reviews in my profile.
I have 6 years experience in this field.
* I do install and configure Interspire + PowerMTA in your server.*
(You need to have server with additional IPs + a new domain)
*This is how much I charge to configure YOUR server with Interspire + PowerMTA (according to number of IPs)*
*upto 3 additional IPs >> $25
*upto 6 additional IPs >> $45
*upto 16 additional IPs >> $65
*upto 25 additional IPs >> $85
The way that works is the following -
We setup and configure properly your SMTP
with proper RDNS, SPF, DKIM, DMARC and never listed domains or IPs.
Then it is how you send, how you write your e-mails and what type of databases which will give your server a good or bad reputation.
then is up to Gmail/Hotmail etc, to decide whether your e-mail "based on your content and IP reputation" falls into spam or inbox and based on each contact user behavior.