NetMail-Light 

NetMail is a mail system for local networks and mobile access, either with the built-in webmail interface, or using NetMail's own client software. Also optimized for GSM, GPRS, UMTS, TCP/IP connections. (Not suited for Outlook as client.)
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RelayFax Server 

RelayFax is a powerful email-to-fax and fax-to-email fax server. RelayFax Pro automates the process of sending, receiving and managing your network fax traffic. By integrating into existing email systems, RelayFax provides full faxing capabillities.
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GFI Network Server Monitor 

Checks your network & servers for failures and fixes them automatically, before your network users notice them! Alerts can be sent by email, pager or SMS. You can reboot a machine, restart a service or run a script, batch job or executable.
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