Looking for a website that allows registered uses to generate/request these types of emails. Take a look at knowbe4 phishing security tool, it will give you an example, although many more example sites exist such as phishingbox.com. You should have plenty of experience in web/software development. Registered used setup their own requirements and phishing emails or can use some templates (must be developed by you) which can be customised to allow user to upload logo's etc. Recording and reporting all emails send, opened, successful, etc. recorded and viewable by registered users using a dashboard as well as being able to request report via pdf. Overall site admin required to manage front-end/back-end an database etc. Secure coding required.
All source code IP would be owned by me and would be required to under go an independent security check prior to payment to ensure there are no backdoors, other security leaks and that the code is secure and robust. Do your research prior to submitting a bid. This could become an ongoing contract.