TML/SIDEX is a BEEP (Block Entensible Exchange Protocol) based SDK for implementing peer to peer and/or client/server communication on various platforms and target languages. It provides type safe data modelling with a simple XML based format that minimizes errors, and its synchronous, asynchronous, and multithreaded interfaces guarantee performance.
Valvula is a high performance mail policy daemon for Postfix. It provides out of the box support for sender login mismatch, mail quotas, per user and per domain blacklists and whitelists, and much more. It is system administrator friendly, providing many automatic features like automatically detecting Postfix MySQL databases to determine local domains and local accounts. It is fully extensible through plugins.