I would like to have a Postfix working similar to Port25 PowerMTA or GreenArrow.
Below are a few settings I believe we will need:
DKIM + SPF + ReverseDNS + Sender ID Setup
Number of simultaneous connections
Number of messages per connection
Number of delivery attempts per hour (ip throttling)
Defining sending limits based on ISP and/or IP Reputation
New IP address warm-up
Ability to create VirtualMTAs or other way of ip rotation allowing to segment mail-streams as necessary. Each VMTA must have its own IP address and delivery policy.