Hello, I have developed a MongoDB module for postfix. Given that mongo-c-driver has gone mainstream on most linux distributions, I personally think this would be a good addition to postfix, allowing users to use MongoDB as a backend database. I am currently using it on the same server sending this email from. You can review the code here : https://github.com/21stcaveman/postfix/tree/mongodb (https://github.com/21stcaveman/postfix/tree/mongodb)
Let me know if any adjustments are needed for this to be merged with the codebase. Regards Hamid Maadani