{"id":27894,"date":"2026-03-04T19:18:22","date_gmt":"2026-03-04T17:18:22","guid":{"rendered":"https:\/\/www.cheops-technology.ch\/docs\/zimbra-openpgp\/"},"modified":"2026-04-20T17:00:17","modified_gmt":"2026-04-20T15:00:17","password":"","slug":"zimbra-openpgp","status":"publish","type":"docs","link":"https:\/\/www.cheops-technology.ch\/en\/docs\/zimbra-openpgp\/","title":{"rendered":"Zimbra OpenPGP"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Aper\u00e7u\">Overview<\/h1>\n\n<p class=\"wp-block-paragraph\">Zimlet OpenPGP enables Zimbra webmail to encrypt and sign e-mail messages.<\/p>\n\n<p class=\"wp-block-paragraph\">OpenPGP encryption prevents your messages from being opened by anyone other than the intended recipient. This will prevent your message from being altered or changed by anyone other than yourself, preserving the authenticity of your content. <\/p>\n\n<ul class=\"wp-block-list\">\n<li><em>What is a <strong>Zimlet<\/strong>? <\/em>\u2013 Zimlets are add-on features for your Zimbra e-mail client that can be found in your Zimbra Preferences tab under \u201cZimlets\u201d. They enhance the functionality of your Zimbra client. <\/li>\n\n\n\n<li><em>What is <strong>PGP\/OpenPGP<\/strong>? <\/em>\u2013 PGP stands for <strong>Pretty<\/strong> <strong>Good<\/strong><strong>Privacy<\/strong>. It is an encryption method shared between two people who have exchanged public and private keys. OpenPGP is a PGP standard based on PGP version 5.x+ security software.  <\/li>\n\n\n\n<li><em>What is a <strong>public\/private key<\/strong>? <\/em>\u2013 Public and private keys are two unique cryptographic keys that work together to encrypt and decrypt information, in this case plain text.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Your<strong> public key<\/strong> can be shared with<em> others<\/em>, while your<strong> private key<\/strong> remains<em> secret<\/em> to you and your Zimbra OpenPGP Zimlet!<\/p>\n\n<ul class=\"wp-block-list\">\n<li><em>Which e-mail applications support <strong>encryption<\/strong>? <\/em>Most modern e-mail and webmail applications can support PGP key encryption technology, including Zimbra webmail, Microsoft Outlook, Thunderbird and others.<\/li>\n<\/ul>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Comment\u00e7amarche?\">How does it work?<\/h1>\n\n<p class=\"wp-block-paragraph\">By creating an encrypted message with OpenPGP Zimlet, only recipients with a corresponding private key can decrypt and read your e-mail. OpenPGP Zimlet makes this process as simple as clicking a few buttons. After composing your e-mail, you can click on the \u201cEncrypt message\u201d option.  <\/p>\n\n<p class=\"wp-block-paragraph\">only<strong> the plain text<\/strong> of the message body is encrypted. This Zimlet automatically converts messages to plain text when you click on \u201cEncrypt message\u201d. <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/8\/8b\/Email-encryption-graphic.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-GuidedeconfigurationOpenPGPZimlet\">Zimlet OpenPGP Configuration Guide<\/h1>\n\n<p class=\"wp-block-paragraph\">1. Open your Zimbra <strong>Preferences<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-38-11.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">2. Navigate to <strong>\u201cZimlets\u201d<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-38-27.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">3. Check the <strong>\u201cOpenPGP\u201d<\/strong> box.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-38-48.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">4. Return to your <strong>\u201cMail\u201d <\/strong> tab <strong> and expand the <\/strong><strong>\u201cZimlets\u201d<\/strong> <strong> options <\/strong> to find <strong>\u201cOpenPGP\u201d<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-39-11.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">5. Right-click on <strong>OpenPGP<\/strong> and select <strong>\u201cGenerate key pair\u201d<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-39-36.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">6. After generating your key pair, it will look like the message below:<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/8\/89\/Generatedkeypair.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Commentenvoyeretrecevoirdescl\u00e9spubliques\">How to send and receive public keys<\/h1>\n\n<p class=\"wp-block-paragraph\">1. To send a public key, simply <strong>right-click on<\/strong> the OpenPGP zimlet under the \u201cZimlets\u201d windows and select <strong>\u201cSend my public key to someone\u201d<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-40-1.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">2. To receive a public key from someone, they\u2019ll usually have to send you their key. You\u2019ll receive an e-mail with a message similar to the image below: <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/d\/d5\/Receivedkey.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-D\u00e9cryptageautomatique\">Automatic decryption<\/h1>\n\n<p class=\"wp-block-paragraph\">You can <strong>enable\/disable<\/strong> the \u201cAutomatic decryption\u201d option in the \u201cManage keys\u201d menu.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/thumb\/b\/b4\/Autodecrypt.png\/680px-Autodecrypt.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Commentenvoyerdesmessageschiffr\u00e9savecOpenPGP\">How to send encrypted messages with OpenPGP<\/h1>\n\n<p class=\"wp-block-paragraph\">. Compose the body of your message, then click on <strong>\u201cEncrypt message\u201d<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>All messages must be formatted as plain text<\/strong>.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-40-33.png\" alt=\"\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\">2. Once you\u2019ve finished and clicked <strong>on \u201cEncrypt message\u201d<\/strong>, you\u2019ll receive a confirmation window.<\/p>\n\n<p class=\"wp-block-paragraph\">  If you\u2019re sending to several recipients, you\u2019ll need to use CTRL + left-click to select multiple addresses. Use CMD + click on Mac. <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/zetalliance.org\/pgp-zimlet\/500px-Finishingmessage.png\" alt=\"Finishing message.png\"\/><\/figure>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/translate.google.com\/website?sl=auto&tl=fr&hl=fr&client=webapp&u=https:\/\/wiki.xmission.com\/File:Finishingmessage.png\"><\/a><\/p>\n\n<p class=\"wp-block-paragraph\">  It\u2019s important to add your attachments during this screen, otherwise they won\u2019t be encrypted.<\/p>\n\n<p class=\"wp-block-paragraph\">3. The body of your message will be encrypted and base64 encoded. You can now send the message to the desired recipients. <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-41-8.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-GestiondevoscontactsCl\u00e9spubliques\">Managing your contacts Public keys<\/h1>\n\n<p class=\"wp-block-paragraph\">When you accept public keys, OpenPGP Zimlet automatically adds them to your <strong>\u201cManaged keys\u201d<\/strong> in the <strong>\u201cPublic keys\u201d<\/strong> section. This is unique to the user who sent them. <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/4\/43\/Managepubkeys.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Importationdevotreproprecl\u00e9priv\u00e9ePGPdansOpenPGP\">Importing your own PGP private key into OpenPGP<\/h1>\n\n<p class=\"wp-block-paragraph\">If you already have your own PGP private key, you can simply paste it into the Private Key field inside the <strong>\u201cManage Keys\u201d<\/strong> section of the OpenPGP zimlet.<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wiki.xmission.com\/images\/thumb\/a\/a1\/Privatekey1.png\/677px-Privatekey1.png\" alt=\"\"\/><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Formatsd'OpenPGPprisencharge\">Supported OpenPGP formats<\/h1>\n\n<h3 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Envoidemessages\"><strong>Sending messages<\/strong><\/h3>\n\n<ul class=\"wp-block-list\">\n<li>Inline-PGP encrypted messages with full UTF-8 support in plain text format<\/li>\n\n\n\n<li>Inline-PGP clear-signed messages with full UTF-8 support in plain text format<\/li>\n\n\n\n<li>Inline-PGP encrypted attachments<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Recevoirdesmessages\"><strong>Receiving messages<\/strong><\/h3>\n\n<ul class=\"wp-block-list\">\n<li>Inline-PGP encrypted messages with full UTF-8 support in plain text format<\/li>\n\n\n\n<li>Inline-PGP clear-signed messages with full UTF-8 support in plain text format<\/li>\n\n\n\n<li>Inline-PGP encrypted attachments<\/li>\n\n\n\n<li>PGP\/MIME messages with text\/plain body parts<\/li>\n\n\n\n<li>PGP\/MIME messages with text\/html body parts will be converted to text.<\/li>\n\n\n\n<li>PGP\/MIME messages with parts using base64 and quoted-printable transfer coding and UTF-8 charset<\/li>\n\n\n\n<li>PGP\/MIME encrypted attachments<\/li>\n<\/ul>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-\u00c0proposdelas\u00e9curit\u00e9descl\u00e9spriv\u00e9es\">About private key security<\/h1>\n\n<p class=\"wp-block-paragraph\">It\u2019s important to keep your private key safe when using public-key cryptography methods such as PGP. Under no circumstances should you share your private key with anyone. <\/p>\n\n<p class=\"wp-block-paragraph\">That said, please note that Zimlet OpenPGP does NOT store your private key on our servers. If you choose to \u201cstore\u201d your private key, it will be stored <em>in your browser, <strong>not on our servers<\/strong><\/em>. It is stored with AES-256 encryption. If you choose to store the secret phrase on your key, this secret phrase can be stored either on our servers or in your browser\u2019s local storage. If you store your passphrase, it is potentially possible for someone with access to your computer to obtain your unencrypted private key.    <\/p>\n\n<p class=\"wp-block-paragraph\">You can also choose not to store anything, by manually supplying your private key and passphrase each time you need to sign or encrypt a message.<\/p>\n\n<p class=\"wp-block-paragraph\">We recommend that you store your key, but not your secret phrase, in your browser. This offers a good balance between security and convenience. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-BureauZimbra\">Zimbra Office<\/h1>\n\n<p class=\"wp-block-paragraph\">For those using the Zimbra Desktop application, this Zimlet is not compatible for installation. You will need to connect to your webmail to use this Zimlet. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"ZimbraOpenPGP-Stockagedescl\u00e9spubliquesdescontactsZimbra\">Public key storage for Zimbra contacts<\/h1>\n\n<p class=\"wp-block-paragraph\"><strong>As an option,<\/strong> you can store public keys in Contacts, the Zimbra address book. First activate the Scan contacts option, then copy\/paste the public keys into the<strong> notes field <\/strong>of your contacts. <\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-41-48.png\" alt=\"\"\/><\/figure>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.cheops-technology.ch\/wp-content\/uploads\/2026\/04\/image2022-5-4_15-42-9.png\" alt=\"\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Overview Zimlet OpenPGP enables Zimbra webmail to encrypt and sign e-mail messages. OpenPGP encryption prevents your messages from being opened by anyone other than the intended recipient. This will prevent your message from being altered or changed by anyone other than yourself, preserving the authenticity of your content. Your public key can be shared with [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":29543,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[133],"doc_tag":[],"class_list":["post-27894","docs","type-docs","status-publish","has-post-thumbnail","hentry","doc_category-email"],"year_month":"2026-06","word_count":885,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"Support","author_nicename":"support","author_url":"https:\/\/www.cheops-technology.ch\/en\/author\/support\/"},"doc_category_info":[{"term_name":"Email","term_url":"https:\/\/www.cheops-technology.ch\/en\/docs-category\/email\/"}],"doc_tag_info":[],"_links":{"self":[{"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/docs\/27894","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/comments?post=27894"}],"version-history":[{"count":11,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/docs\/27894\/revisions"}],"predecessor-version":[{"id":29581,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/docs\/27894\/revisions\/29581"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/media\/29543"}],"wp:attachment":[{"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/media?parent=27894"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/doc_category?post=27894"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/www.cheops-technology.ch\/en\/wp-json\/wp\/v2\/doc_tag?post=27894"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}