i would like to help you with smtp server installation with powermta
All authentication mode - dkim , spf , sender id , domain key
rdns , virtual mta technology , mx , dns , fwdns , feedback loop , back off mode
I am new to freelancer but have got vast experience in mailing ..
you dont need to pay for powermta
I will host interspire 6.3 and integrate it with powermta 4.0 best smtp server software available in marketing
If you have any question regarding mailing please feel free to ask me .. Let me know if you are also interested in interspire addons like feedback loop , multiple mta and ip monitor, social , backup etc ..
Thanks