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Email Hosting

InteSys offers two email hosting solutions to fit different organizational needs: Corporate Email powered by Zimbra/Carbonio for full groupware capabilities, and Professional Email powered by Stalwart Mail Server for modern, lightweight email.

Plans Comparison

Feature Corporate Email Professional Email
Platform Zimbra / Carbonio Stalwart Mail Server
Custom domain email
Webmail interface
IMAP / POP3 / SMTP
Calendar & scheduling
Contacts management
Shared folders & files
Video conferencing
Mobile sync (ActiveSync)
Spam & antivirus filtering
SPF / DKIM / DMARC
Admin panel
Storage per mailbox 10–50 GB 5–25 GB
Best for Medium/large organizations Small teams, startups

Corporate Email (Zimbra / Carbonio)

The Corporate plan is a full-featured groupware platform designed for organizations that need more than just email.

Key Features

  • Email: Full IMAP/POP3/SMTP with powerful search and filtering
  • Calendar: Shared calendars, meeting scheduling, room booking, and resource management
  • Contacts: Global address lists and shared contact folders
  • Files: Cloud-based file storage with sharing and collaboration
  • Video: Integrated video conferencing for internal meetings
  • Mobile: ActiveSync support for seamless mobile device integration
  • Admin: Delegated administration with granular role-based access control

Migration Assistance

Migrating from Exchange, Google Workspace, or another provider? InteSys provides assisted migration to transfer mailboxes, calendars, and contacts with minimal disruption.

Professional Email (Stalwart)

The Professional plan provides reliable, standards-compliant email on a modern Rust-based mail server optimized for performance and security.

Key Features

  • Performance: Written in Rust for memory safety and low resource usage
  • Standards: Full JMAP, IMAP4rev2, IMAP4rev1, ManageSieve, and SMTP support
  • Security: Built-in spam filtering, antivirus integration, and DANE/MTA-STS
  • Authentication: Native SPF, DKIM, DMARC, and ARC support
  • Webmail: Clean, modern webmail interface
  • Admin: Web-based administration panel for domain and account management

No Groupware

The Professional plan focuses on email only. If you need calendars, contacts, or file sharing, choose the Corporate plan or integrate with a third-party solution.

Included with Both Plans

  • Anti-spam filtering — Multi-layer spam detection with machine learning
  • Antivirus scanning — Real-time attachment scanning
  • Encryption — TLS for all connections, optional S/MIME support
  • DNS management — Automated MX, SPF, DKIM, and DMARC configuration assistance
  • 99.9% uptime SLA — With email stored on redundant infrastructure

Next Steps