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What is Zimbra?

Zimbra 9: The Ultimate Collaboration Champions! Users can effortlessly transition between desktop, tablet, and mobile browsers while experiencing consistent email and collaborative functionality. It boasts extensibility and provides top-tier integrations with platforms like Slack and Dropbox, with even more integrations in the pipeline. The Zimlet framework empowers customization of Zimbra to meet individual needs. With a robust server infrastructure, Zimbra guarantees customers the security, privacy, and data sovereignty they rightfully expect. Transitioning to Zimbra 9 is straightforward and does not necessitate any data migration. Featuring a sleek, modern user interface, Zimbra 9 is underpinned by Zimbra's dependable server infrastructure, ensuring the security and privacy that users have relied upon. Unlike competitors that operate on closed systems, Zimbra 9 offers flexibility and extensibility. Break free from Microsoft and Google, and embrace the integration capabilities with a variety of third-party collaboration tools like Dropbox, Zoom, and Slack, enhancing your collaborative experience even further. This adaptability makes Zimbra 9 a standout choice for businesses seeking to optimize communication and productivity.

What is Aster Mail?

Aster Mail is a free, open-source email service that prioritizes user privacy through end-to-end encryption, offering a straightforward experience that avoids complicated technical hurdles. The encryption happens directly on the user's device, guaranteeing that our servers remain uninformed about the contents of messages or any related metadata. By leveraging the widely recognized OpenPGP standard with RSA-4096 keys, Aster allows users to maintain independence from any single provider, as their keys are compatible with GPG, Thunderbird, or any other PGP-enabled client, and can be easily found through WKD and public key servers. For communications between users of Aster, the service utilizes a Signal-inspired X3DH and Double Ratchet protocol, which significantly boosts forward secrecy. Each subscription level includes encrypted email functionalities, the ability to use custom domains, free aliases, protection from trackers, and unrestricted access on both web and desktop interfaces. The entire codebase is released under the AGPL v3 license on GitHub, promoting rigorous audits, and it includes a public warrant canary along with a transparent vulnerability disclosure policy to enhance user trust. The free subscription offers 10 GB of encrypted storage, 5 aliases, and 1 custom domain, while paid plans commence at just $2.99 monthly, with all servers based in Germany to comply with strict data protection laws. Users can confidently communicate, knowing their messages are safeguarded by leading encryption technologies, making Aster Mail an excellent choice for those valuing privacy. Moreover, the user-friendly interface ensures that even those with limited technical knowledge can take full advantage of its robust security features.

Media

Media

No images available

Integrations Supported

DialWebHosting
Exterro
Komz
LegacyFlo
MailArchiva
N-able Mail Assure
NetForChoice
Raptor Email Security
RecoveryTools Email Backup Wizard
Siberson Veriket Data Classification
Sigilium
SimplyMeet.me
SoftSpire Zimbra Converter
Sprinklr Social
TeraBox
Useit Fax Server
Zoho Directory
Zoom
tenfold
vtenext

Integrations Supported

DialWebHosting
Exterro
Komz
LegacyFlo
MailArchiva
N-able Mail Assure
NetForChoice
Raptor Email Security
RecoveryTools Email Backup Wizard
Siberson Veriket Data Classification
Sigilium
SimplyMeet.me
SoftSpire Zimbra Converter
Sprinklr Social
TeraBox
Useit Fax Server
Zoho Directory
Zoom
tenfold
vtenext

API Availability

Has API

API Availability

Has API

Pricing Information

Varies
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Synacor

Date Founded

1998

Company Location

United States

Company Website

www.zimbra.com

Company Facts

Organization Name

Aster Mail

Date Founded

2025

Company Location

United States

Company Website

astermail.org

Categories and Features

Collaboration

Brainstorming
Calendar Management
Chat / Messaging
Contact Management
Content Management
Document Management
Project Management
Real Time Editing
Task Management
Version Control
Video Conferencing

Email Management

Data Recovery
Email Archiving
Email Deletion
Email Discovery
Email Monitoring
Email Recall
Queue Manager
Response Management
Routing
Shared Inboxes
Signature Management
Spam Blocker
Whitelisting / Blacklisting

Messaging

End-to-End Encryption (E2EE)
File Sharing
Groups / Channels
Payments
Search / Filter
Self-Destructing Messages
Stickers / GIFs
Threaded Discussion
Video Conferencing
Voice Calling

Social Networking

Activity / News Feed
Advertising Management
Blogs
Data Security
Event Management
Group Management
Media Library
Privacy Options
Real-time Chat
Social Media Integration
Social Media Tagging
User Profiles

Team Chat

End-to-End Encryption (E2EE)
File Sharing
Groups / Channels
Payments
Search / Filter
Self-Destructing Messages
Stickers / GIFs
Threaded Discussion
Video Conferencing
Voice Calling

Team Communication

Activity / News Feed
Audio Calls
Calendar Management
Chat / Messaging
Discussion Threads
File Sharing
Mobile Access
Push Notifications
Search
Surveys & Feedback
Task Management
Video Conferencing

Categories and Features

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Popular Alternatives

No Alternatives
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