ASPnix Email Archiving, $ 20.00/mo. on Windows Emails

This archiving add-on is charged per domain and is intended for compliance, legal hold, discovery, search, retention policies, and long-term message preservation.
It suits regulated environments, organizations with audit requirements, or teams that need historical message access without depending only on user mailboxes.
The platform description emphasizes searchable archives, policy-based retention, and compliance-oriented administration.

The enterprise email group is built on SmarterMail Enterprise and positioned as a full Exchange alternative with native Outlook connectivity through MAPI, Exchange Web Services support, Exchange ActiveSync availability, shared calendars, contacts, tasks, resource booking, XMPP chat, file sharing, and integrated webmail.
Security is a major theme throughout the platform, with TLS/SSL on all core protocols, DKIM, SPF, DMARC, rspamd with machine learning, Spamhaus Enterprise intelligence, AI-driven filtering, two-factor authentication, intrusion detection, GeoIP blocking, S/MIME, and extensive policy and compliance controls.
The service is intended to scale from very small deployments to very large environments, while preserving predictable usage-based pricing instead of forcing fixed mailbox tiers.
Users also get collaboration features such as shared calendars, meeting requests, group chat, online meetings, personal cloud file storage, responsive webmail, and native mobile sync, all backed by a 100% uptime SLA and 24/7 expert support.