The project is for a large-scale list server with optional marketing features like click-through and opens tracking. The ultimate goal would be to support the functionality found in the well-established email marketing services.
I thought I would develop a specification first because the development work may be in phases, with different people handling components for features.
The system should handle unlimited virtual domains; multiple lists per domain, delegated management to list managers, etc. It should utilize a SQL backend, preferable postgresql, and be able to scale across servers, etc. It should use open source applications where possible. I expect to add some enhancements in phases. It would be nice to get the MTA and possibly the list server right in the first place so that acquired expertise is well invested.
Predominantly, the system will have to handle many small lists, but it should be able to support a few huge lists as well.
2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request.
3) Exclusive and complete copyrights to all work purchased. (No GPL, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site).
Open source where possible, Linux, PHP, PostgreSQL or MySQL, MTA (probably Postfix, Exim, or Sendmail)