Webmail
Zimbra Collaboration privacy rating
Self-hosted email and collaboration server from Synacor, with a web client for mail, calendar, contacts and files. An open-source edition and a commercial Network Edition with extra features are offered.
Summary
Zimbra Collaboration scores 50 out of 100 (grade D) on the webmail criteria. It meets 4 of 9 criteria: no ads or data sales, connects directly, blocks remote content and self-hostable. It partly meets open source. It does not meet no trackers or telemetry, independent audit, OpenPGP support and works with any provider. It is based in the United States: Five Eyes member; subject to the US CLOUD Act.
Score 50 out of 100. How scoring works
Criteria
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Partial
Open source Weight 3 of 3
Is all the source code needed to run the product public?
The open-source edition, including the web client, is public under CPAL-1.0 and GPL-2.0, but the commercial Network Edition adds closed-source features.
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No
No trackers or telemetry Weight 3 of 3
Are the website and apps free of third-party trackers, with any analytics anonymous and any telemetry off by default?
The website loads Google Analytics, HubSpot and New Relic.
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Yes
No ads or data sales Weight 2 of 3
Is the product funded without advertising, ad targeting or selling user data?
Funded by commercial licenses and support. No ads.
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No
Independent audit Weight 2 of 3
Has an independent security or privacy audit been published within the last three years?
No independent audit is published.
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No
OpenPGP support Weight 2 of 3
Can the app encrypt and sign mail with OpenPGP, built in or through an official add-on?
OpenPGP is not supported. S/MIME is offered in the Network Edition.
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Yes
Connects directly Weight 3 of 3
Does the app connect directly to your mail server, without passing mail or passwords through the vendor's servers?
Self-hosted. The web client talks to the Zimbra server where it is installed, with no vendor service involved.
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Yes
Blocks remote content Weight 2 of 3
Are remote images and tracking pixels blocked by default?
The zimbraPrefDisplayExternalImages preference is off by default, so external images load only on request.
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No
Works with any provider Weight 1 of 3
Does the app work with any standard IMAP and SMTP provider?
The web client works only with a Zimbra server. Other IMAP and POP3 accounts can only be pulled into a Zimbra mailbox.
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Yes
Self-hostable Weight 1 of 3
Can the webmail be installed on your own server?
Self-hosted software with an official installation guide.