System Requirements

IceWarp Server runs on all Windows versions and most Linux flavours.

Operating System

IceWarp Mail Server is a multi-platform software and runs under many popular systems, as a daemon under Linux, as a service with modern Windows Server and Workstation, as an application under legacy Windows versions. This allows to leverage your existing OS licenses, or migrate to opensource to minimize investment and maximize server security.

  • Native 32-bit application, runs in 64-bit compatibility mode
  • MS Windows NT (n/a for WebMail), 2000, 2003 Server/Workstation
  • MS Windows 98, ME, XP (Home, Professional), Vista
  • Latest Service Packs and hot-fixes
  • x86 Linux distribution, RedHat Enterprise Linux or CentOS recommended
  • System independent PHP5 included

Hardware Requirements

Mail server engine is extremely resource aware and will run even on fairly modest hardware. Exact requirements are dependent on services traffic, user activity, settings of resource intensive features, number of add-on modules and communication usage patterns. This is especially true for dimensioning the disk storage capacity.

If you plan to have thousands of users or expect heavy traffic, consider a dual-CPU system, Xeon processor or better, at least 1GB RAM and fast disk sub-system (SerialATA, SCSI). RAID is beneficial only if you require top data integrity or if configured to maximize disk I/O speed. External fileserver for data storage and backup is recommended for ISP-class installations.

# of Users (all domains) Estimated HDD volume Recommended HW/SW configurations
1 - 50 5 GB Win2000/XP/2003, CPU 750Mhz+, RAM 256MB
51 - 2,000 100-200 GB Win2000/2003 Server, CPU 1.5Ghz, RAM 1GB
2,001 - 5,000 200 GB in RAID MS SQL 2000/2003, Win2000/2003 Server, Dual CPU 2Ghz, RAM 2GB
5,001 and more RAID or NAS Load-balanced setup with dedicated database and backup storage

Most small to middle businesses will require only one computer. For large installations, inquire for a free consultation with our engineers.


Only TCP/IP is required to use IceWarp Merak Mail Server on a LAN for local email solution (office network). Connection to Internet can be accomplished in multiple ways, for MTA functionality, permanent connection is a prerequisite.

  • Permanent connection
  • Scheduled dial-up
  • RAS access
  • Dial on demand router
  • Local TCP/IP for internal LAN usage

Registered domain name with correctly configured DNS MX and rDNS A records are required for Internet mail exchange and server credibility. There are options to help identification of possible errors.

  • Automatic DNS configuration from OS settings
  • Built-in server diagnostics, DNS tests
  • DNS Query troubleshooting utility

Firewall is strongly recommended to close ports not in use.