AXIGEN Mail Server Service Provider Edition

AXIGEN - a carrier-class messaging solution for Service Providers. It runs on Windows, Linux, BSD, Solaris and offers unmatched manageability and control over the email traffic: (E)SMTP/POP3/IMAP4 services, Webmail access from PCs and mobile phones, integrated List Server, failsafe storage, automatic migration, advanced logging/reporting, centralized Web/CLI Admin, delegated administration, clustering support, FREE technical support.