Changes to Interspire Email Marketer (IEM)

Looking for a developer to modify Interspire Email Marketer We currently have multiple installations of IEM but it's hard to manage Want to move to one IEM using multiple domains/smtp/ip per campaign All references to domain/smtp/ip in emails headers and body to refer to one domain/smtp/ip When importing contacts into lists check for duplicate emails across all lists Specify sending days/hours and have sending suspend/resume automatically outside those hours Fix problem with dynamic content - when we try to setup dynamic content IEM crashes out Monitor health of domain/smptp/ip on rbl etc during sending Handle unsubscribes from people who reply to the email saying unsubscribe in the subject or body etc instead of clicking the unsubscribe link. Please explain your experience on IEM, jobs you have done, suggest other modifications we might want to make.