OpenText Core Email Encryption is a commercial email encryption solution by OpenText Cybersecurity. Z1 SecureMail Gateway is a commercial email encryption solution by Zertificon Solutions GmbH. Features, integrations, deployment and the company behind each one, side by side.
Cloud-based email encryption with automated DLP policies and delivery methods
Enterprise email encryption gateway supporting S/MIME, OpenPGP, and digital signing.
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Based on what each listing shows: deployment, company size, price and open source.
OpenText Core Email Encryption fits if you want a cloud product.
Z1 SecureMail Gateway fits if you need both cloud and on-premises options and you are a startup.
Common questions when comparing OpenText Core Email Encryption vs Z1 SecureMail Gateway for email encryption.
OpenText Core Email Encryption: Cloud-based email encryption with automated DLP policies and delivery methods. Built by OpenText Cybersecurity.
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.
OpenText Core Email Encryption is made by OpenText Cybersecurity. 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.
Often, yes. OpenText Core Email Encryption and Z1 SecureMail Gateway are both Email Encryption products, and both cover TLS. Use the table above to see where features, deployment and company size fit differ.
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Updated 2026-11-02
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