# Kiteworks Secure Email vs Z1 SecureMail Gateway: side-by-side comparison (2026) [Kiteworks Secure Email](https://cybersectools.com/tools/kiteworks-secure-email) is a commercial [email encryption](https://cybersectools.com/categories/email-encryption) solution by [Kiteworks](https://cybersectools.com/companies/kiteworks). [Z1 SecureMail Gateway](https://cybersectools.com/tools/zertificon-z1-solutions) is a commercial [email encryption](https://cybersectools.com/categories/email-encryption) solution by [Zertificon Solutions GmbH](https://cybersectools.com/companies/zertificon-solutions-gmbh). Features, integrations, deployment and the company behind each one, side by side. ## Side-by-side comparison | | Kiteworks Secure Email | Z1 SecureMail Gateway | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Email Encryption | Email Encryption | | Verified | No | Verified | | Deployment type | Hybrid | Hybrid | | Company size fit | SMB, Mid-Market, Enterprise | Mid-Market, Enterprise, SMB, Startup | | Company | Kiteworks | Zertificon Solutions GmbH | | Headquarters | – | – | ### Use cases and capabilities | | Kiteworks Secure Email | Z1 SecureMail Gateway | |---|---|---| | Encryption | Yes | Yes | | Gateway | – | Yes | | GDPR | – | Yes | | SMTP | – | Yes | | Microsoft 365 | – | Yes | | Supply Chain Security | – | Yes | | Healthcare | – | Yes | | DKIM | – | Yes | | TLS | – | Yes | | DMARC | – | Yes | ### Core features **Kiteworks Secure Email** 10 features listed. Sign in on the page to see them. **Z1 SecureMail Gateway** - Digital email signing for authenticity and integrity - Automated certificate management via CertMagic® - Inter-organizational encrypted email exchange via GlobalCrypt® - Cloud deployment support for Azure/M365 and Google Cloud/Workspace - Centralized server-side encryption transparent to end users - GDPR-compliant secure data exchange - EU NIS2 Directive compliance support - Secure large file transfer capability ### Integrations **Kiteworks Secure Email** 11 integrations listed. Sign in on the page to see them. **Z1 SecureMail Gateway** - Microsoft Azure - Microsoft 365 - Google Cloud - Google Workspace - Z1 Global TrustPoint - SwissSign ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Z1 SecureMail Gateway](https://cybersectools.com/tools/zertificon-z1-solutions) fits if you are a startup. ## Kiteworks Secure Email vs Z1 SecureMail Gateway FAQ Common questions when comparing Kiteworks Secure Email vs Z1 SecureMail Gateway for email encryption. ### What is the difference between Kiteworks Secure Email and Z1 SecureMail Gateway? **Kiteworks Secure Email**: Secure email platform with encryption, DLP, and policy automation. Built by Kiteworks. **Z1 SecureMail Gateway**: Enterprise email encryption gateway supporting S/MIME, OpenPGP, and digital signing. Built by Zertificon Solutions GmbH. Core capabilities include Digital email signing for authenticity and integrity, Automated certificate management via CertMagic®, Inter-organizational encrypted email exchange via GlobalCrypt®. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Kiteworks Secure Email and Z1 SecureMail Gateway? **Kiteworks Secure Email** is made by Kiteworks. **Z1 SecureMail Gateway** is made by Zertificon Solutions GmbH. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is Kiteworks Secure Email a good alternative to Z1 SecureMail Gateway? Often, yes. Kiteworks Secure Email and Z1 SecureMail Gateway are both Email Encryption products, and both cover Encryption. Use the table above to see where features, deployment and company size fit differ. ## Related comparisons - [Kiteworks Secure Email vs LuxSci](https://cybersectools.com/compare/kiteworks-secure-email-vs-luxsci) - [Kiteworks Secure Email vs SEPPmail Secure Email Gateway](https://cybersectools.com/compare/kiteworks-secure-email-vs-seppmail-secure-email-gateway) - [Kiteworks Secure Email vs Beyond Encryption Mailock Enterprise](https://cybersectools.com/compare/beyond-encryption-mailock-enterprise-vs-kiteworks-secure-email) - [Z1 SecureMail Gateway vs LuxSci](https://cybersectools.com/compare/luxsci-vs-zertificon-z1-solutions) - [Z1 SecureMail Gateway vs SEPPmail Secure Email Gateway](https://cybersectools.com/compare/seppmail-secure-email-gateway-vs-zertificon-z1-solutions) - [Z1 SecureMail Gateway vs Beyond Encryption Mailock Enterprise](https://cybersectools.com/compare/beyond-encryption-mailock-enterprise-vs-zertificon-z1-solutions) ## Alternatives to each - [See all Kiteworks Secure Email alternatives](https://cybersectools.com/alternatives/kiteworks-secure-email) - [See all Z1 SecureMail Gateway alternatives](https://cybersectools.com/alternatives/zertificon-z1-solutions) --- Source: https://cybersectools.com/compare/kiteworks-secure-email-vs-zertificon-z1-solutions For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/kiteworks-secure-email.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Kiteworks Secure Email and Z1 SecureMail Gateway: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md