You have to be experienced in php and mysql.
This is a nice project if you know what you are doing. Otherwise it can be a nightmare (very difficult to do an acceptable job).
So, please bid ONLY IF you already have a lot of experience and can do it quickly because if you fail I lose time and you lose money.
The goal is have the core features with a nice UI.
Core features include allow creating these:
--> a list of sequential emails
--> new list with address, urls for thankyou page, etc
--> send the emails automatically using Linux server
--> track link clicks
--> allow segmenting based on click behavior
--> allow deleting / moving subscribers who have not opened / clicked any email is so many days
--. track how many people open /read emails
Have you used any autoresponder service such as Awerber