The purpose of this RFP is to enhance the cybersecurity of communication and collaboration of our cities, counties, and municipalities in South Dakota by establishing a unified, scalable solution for a secured email solution. This RFP supports a strategic cybersecurity initiative (SecureSD https://madlabs.dsu.edu/securesd/). This specific RFP is aimed at protecting South Dakota cities, counties, and municipalities from email-borne attacks while ensuring operational integrity, data confidentiality, and compliance with best practices. Cities and counties across South Dakota rely on email infrastructure for essential government communications, public service coordination, and interagency collaboration. The rise in targeted phishing campaigns, email spoofing, malware delivery, and spam necessitates a unified, secure, and scalable solution that can be implemented for entities of varying size and technical capacity. Currently, South Dakota cities and counties are using multiple public platforms (Gmail, Hotmail, Yahoo, personal email, etc.), making it difficult to identify the entity, secure, and protect them from cybersecurity attacks. We have a need for global address listings, calendaring, collaboration, etc. This solution will have employees on the same system so internal emails remain encrypted within the same email system and never go to the public internet or another email system. The state is seeking proposals from qualified vendors to provide a Secure Email Solution to participating South Dakota cities, counties and municipal governments. The anticipated clients for these services include city & county law enforcement, auditors, treasurers, finance officers, municipal utility, street & highway, elected officials, other employees or accounts deemed necessary, etc.