We’re not just securing email and e-signing.

We’re helping Zimbra users get more value packed into their email platform; built-in.

And we’ve been doing it with them since 2009.

RMail. For Messaging. Across Industry.

  • Industry


  • Sector

All Business

  • Geography


  • Platform

RMail® & RSign®

Primary Use

RMail adds security, e-signature, and compliance services that run within the Zimbra email interfaces.

Watch full video of Branden Haines discuss RMail at Optimize!2020.

opening quote

The RMail and RSign feedback has been great. Everyone wants to use these products. The senior-level attorneys are always going to use RPost if they send anything out…The fact that RMail is going to be integrated with cleanDocs is going to encourage more use.

closing quote
Branden Haines, CTO at Dickinson Law

Branden Haines

CTO, Dickinson Law

Main Benefit

RMail adds a variety of high value messaging security, e-signature, and compliance services that run within the Zimbra email interfaces, making Zimbra better for business. The all-in-one interface of RMail for Zimbra speeds business, reduces administrative time and makes software services more affordable.

Users benefit with simple one-click options to send Registered Email™ messages to track, prove, and certify content and timestamp of e-delivery, options to encrypt the message and attachments, send for electronic signature, send large file transfers, and enable additional e-security and e-collaboration options. E-sign contracts and Registered Receipt™ proof records import into the Zimbra inbox structure.


RMail® and RSign® are integrated into Zimbra using the Zimlet structure. The RMail for Zimba add-in preserves the native functionality of Zimbra and the outbound SMTP message stream. The RMail large file transfer services use RMail REST API. RSign is connected to Zimbra using REST API.

Each e-sign completion and each message sent return the final Registered Receipt™ and e-sign records into the Zimbra Inbox (into auto-generated receipt and contracts folders). These include delivery and e-sign forensics, cryptographically sealed to the delivery content and timestamp, and packaged as a Registered Receipt™ proof record or a signature certificate record.

Zimbra by Synacor is one of the world’s most popular business productivity and communications platforms.

Tradenames are owned by the named company. Service benefit is summary, not intended to be a case study.RPost technology is patented. RMail, RSign, and RPost are trademarks owned by RPost.