{"id":8049,"date":"2026-06-29T16:31:40","date_gmt":"2026-06-29T15:31:40","guid":{"rendered":"https:\/\/www.varcap-informatique.net\/tutoriels\/?p=8049"},"modified":"2026-06-29T16:32:18","modified_gmt":"2026-06-29T15:32:18","slug":"installer-une-signature-html-dans-apple-mail-sur-macos","status":"publish","type":"post","link":"https:\/\/www.varcap-informatique.net\/tutoriels\/installer-une-signature-html-dans-apple-mail-sur-macos\/","title":{"rendered":"Installer une signature HTML dans Apple Mail sur macOS"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Mail sur macOS synchronise les signatures via iCloud Drive. Tant que cette synchronisation est active, tout fichier .mailsignature ajout\u00e9 manuellement est \u00e9cras\u00e9 ou ignor\u00e9. La solution : d\u00e9sactiver la synchronisation Mail dans iCloud Drive le temps d&rsquo;installer les signatures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pr\u00e9requis<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoir un fichier HTML de signature pr\u00eat (images en base64, pas d&rsquo;URL externe)<\/li>\n\n\n\n<li>Utiliser <strong>Chrome<\/strong> (pas Safari) pour le copier-coller<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c9tape 1 : D\u00e9sactiver la synchronisation Mail dans iCloud Drive<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Quittez l&rsquo;application <strong>Mail<\/strong> compl\u00e8tement (Cmd+Q)<\/li>\n\n\n\n<li>Ouvrez <strong>R\u00e9glages syst\u00e8me<\/strong><\/li>\n\n\n\n<li>Cliquez sur votre <strong>nom<\/strong> en haut \u00e0 gauche<\/li>\n\n\n\n<li>Cliquez sur <strong>iCloud<\/strong><\/li>\n\n\n\n<li>Cliquez sur <strong>iCloud Drive<\/strong><\/li>\n\n\n\n<li>Cliquez sur <strong>Apps se synchronisant avec iCloud Drive<\/strong><\/li>\n\n\n\n<li><strong>D\u00e9sactivez Mail<\/strong><\/li>\n\n\n\n<li>Cliquez <strong>Termin\u00e9<\/strong><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c9tape 2 : Cr\u00e9er les signatures dans Mail<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ouvrez l&rsquo;application <strong>Mail<\/strong><\/li>\n\n\n\n<li>Allez dans <strong>R\u00e9glages \u2192 Signatures<\/strong><\/li>\n\n\n\n<li>Cliquez sur <strong>+<\/strong> pour cr\u00e9er une nouvelle signature vide. Donnez-lui un nom (ex. \u00ab\u00a0Signature\u00a0\u00bb)<\/li>\n\n\n\n<li>R\u00e9p\u00e8tez pour chaque signature n\u00e9cessaire<\/li>\n\n\n\n<li><strong>Quittez l&rsquo;application Mail<\/strong> (Cmd+Q)<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c9tape 3 : Injecter le contenu HTML<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ouvrez le fichier .html qui contient votre signature dans <strong>Chrome<\/strong><\/li>\n\n\n\n<li>Affichez le code source : Cmd+U<\/li>\n\n\n\n<li>Dans le source, localisez &lt;body> et &lt;\/body><\/li>\n\n\n\n<li>S\u00e9lectionnez <strong>uniquement le contenu avec ces deux balises<\/strong><\/li>\n\n\n\n<li>Cmd+C pour copier<\/li>\n\n\n\n<li>Allez dans <strong>Biblioth\u00e8que\/Mail\/Vxx\/MailData\/Signatures<\/strong><\/li>\n\n\n\n<li>Faites un clique-droit sur le fichier <strong>xxxxx.mailsignation<\/strong> puis s\u00e9lectionnez <strong>Ouvrir avec\/TextEdit<\/strong><\/li>\n\n\n\n<li>Supprimez tout le texte en dessous de <em>Mime-Version: 1.0 (Mac OS X Mail 16.0 (3893.100.7.1.1))<\/em><\/li>\n\n\n\n<li>Cmd+V pour coller le texte copi\u00e9 en \u00e9tape 5 <\/li>\n\n\n\n<li>Enregistrez le fichier et quittez TextEdit<\/li>\n\n\n\n<li>Rouvrez l&rsquo;application <strong>Mail<\/strong> puis allez dans R\u00e9glages \u2192 Signatures<\/li>\n\n\n\n<li>R\u00e9p\u00e9tez les \u00e9tapes 7 \u00e0  10 pour chaque signature<\/li>\n\n\n\n<li><strong>Quittez<\/strong> l&rsquo;application <strong>Mail<\/strong> (Cmd+Q)<\/li>\n\n\n\n<li>Rouvrez l&rsquo;application Mail et v\u00e9rifiez que les signatures sont toujours pr\u00e9sentes<\/li>\n\n\n\n<li>Red\u00e9marre le Mac et v\u00e9rifiez de nouveau<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c9tape 4 : R\u00e9sultat selon ton usage<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Si vous n&rsquo;avez pas besoin de la synchronisation iCloud pour Mail<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Laissez Mail d\u00e9sactiv\u00e9 dans iCloud Drive. Les signatures ne disparaitront pas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Si vous voulez r\u00e9activer la sync iCloud pour Mail<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#x26a0;&#xfe0f; <strong>Attention<\/strong> : la r\u00e9activation d&rsquo;iCloud pour Mail efface les fichiers <strong>.mailsignature<\/strong> locaux et les remplace par la version iCloud (vide ou ancienne). Les signatures HTML disparaissent.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Il n&rsquo;existe pas de solution pour conserver des signatures HTML personnalis\u00e9es <strong>et<\/strong> garder la synchronisation iCloud Mail active simultan\u00e9ment sur macOS r\u00e9cent.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le copier-coller depuis Safari ne fonctionne pas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Safari ajoute du formatage propri\u00e9taire au moment du copier-coller vers Mail, ce qui casse la mise en forme HTML. <strong>Chrome<\/strong> transmet le HTML brut tel quel  c&rsquo;est la seule diff\u00e9rence.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi les images doivent \u00eatre en base64<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Mail.app bloque le chargement des images h\u00e9berg\u00e9es en ligne dans les signatures (politique de confidentialit\u00e9 Apple). Les images doivent \u00eatre <strong>embarqu\u00e9es directement dans le HTML<\/strong> via encodage base64 pour s&rsquo;afficher correctement, aussi bien dans Mail que chez le destinataire.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"dep-banner\"><\/div>\n<script>\n(function() {\n  \/\/ Coordonn\u00e9es centre de Dijon\n  var DIJON_LAT = 47.3220;\n  var DIJON_LNG = 5.0415;\n  var RAYON_KM  = 100;\n\n  function distanceKm(lat1, lng1, lat2, lng2) {\n    var R = 6371;\n    var dLat = (lat2 - lat1) * Math.PI \/ 180;\n    var dLng = (lng2 - lng1) * Math.PI \/ 180;\n    var a = Math.sin(dLat\/2) * Math.sin(dLat\/2)\n          + Math.cos(lat1 * Math.PI\/180) * Math.cos(lat2 * Math.PI\/180)\n          * Math.sin(dLng\/2) * Math.sin(dLng\/2);\n    return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));\n  }\n\n  function bannerDijon() {\n    return '<div style=\"background:#1a2e4a;border-radius:12px;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:16px;\">'\n      + '<div>'\n      + '<div style=\"display:inline-block;background:#c8952a;color:#fff;font-size:12px;font-weight:600;padding:3px 12px;border-radius:20px;margin-bottom:10px;\">Particuliers &amp; entreprises<\/div>'\n      + '<div style=\"color:#fff;font-size:17px;font-weight:600;margin-bottom:8px;\">D\u00e9pannage informatique \u00e0 domicile \u2014 Dijon<\/div>'\n      + '<div style=\"color:#a8c8f0;font-size:14px;\">Devis gratuit \u00b7 Intervention sous 48h<\/div>'\n      + '<\/div>'\n      + '<a href=\"https:\/\/depannage-informatique-21.fr\" style=\"background:#c8952a;color:#fff;font-size:14px;font-weight:700;padding:12px 20px;border-radius:8px;text-decoration:none;white-space:nowrap;flex-shrink:0;\">En savoir plus \u2192<\/a>'\n      + '<\/div>';\n  }\n\n  function bannerParis() {\n    return '<div style=\"background:#1a2e4a;border-radius:12px;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:16px;\">'\n      + '<div>'\n      + '<div style=\"display:inline-block;background:#c8952a;color:#fff;font-size:12px;font-weight:600;padding:3px 12px;border-radius:20px;margin-bottom:10px;\">Particuliers &amp; entreprises<\/div>'\n      + '<div style=\"color:#fff;font-size:17px;font-weight:600;margin-bottom:8px;\">D\u00e9pannage informatique \u00e0 domicile ou sur site \u2014 Paris &amp; banlieue<\/div>'\n      + '<div style=\"color:#a8c8f0;font-size:14px;\">\u2605\u2605\u2605\u2605\u2605 4,8\/5 sur Google \u00b7 Devis gratuit \u00b7 Intervention sous 24h \u00e0 48h<\/div>'\n      + '<\/div>'\n      + '<a href=\"https:\/\/depannage-informatique-75019.paris\" style=\"background:#c8952a;color:#fff;font-size:14px;font-weight:700;padding:12px 20px;border-radius:8px;text-decoration:none;white-space:nowrap;flex-shrink:0;\">En savoir plus \u2192<\/a>'\n      + '<\/div>';\n  }\n\n  function show(html) {\n    document.getElementById('dep-banner').innerHTML = html;\n  }\n\n  fetch('https:\/\/ipwho.is\/')\n    .then(function(r) { return r.json(); })\n    .then(function(d) {\n      if (d.success && d.latitude && d.longitude) {\n        var dist = distanceKm(d.latitude, d.longitude, DIJON_LAT, DIJON_LNG);\n        show(dist <= RAYON_KM ? bannerDijon() : bannerParis());\n      } else {\n        show(bannerParis());\n      }\n    })\n    .catch(function() { show(bannerParis()); });\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Mail sur macOS synchronise les signatures via iCloud Drive. Tant que cette synchronisation est active, tout fichier .mailsignature ajout\u00e9 manuellement est \u00e9cras\u00e9 ou ignor\u00e9. La solution : d\u00e9sactiver la synchronisation Mail dans iCloud Drive le temps d&rsquo;installer les signatures. Pr\u00e9requis \u00c9tape 1 : D\u00e9sactiver la synchronisation Mail dans iCloud Drive \u00c9tape 2 : Cr\u00e9er les [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8050,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[960],"tags":[],"class_list":["post-8049","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apple-mail"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Mail.app sur macOS synchronise les signatures via iCloud Drive. Tant que cette synchronisation est active, tout fichier .mailsignature\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Arnault\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.varcap-informatique.net\/tutoriels\/installer-une-signature-html-dans-apple-mail-sur-macos\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.9\" \/>\n\t\t<meta property=\"og:locale\" content=\"fr_FR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"\u00a0Varcap Informatique\u00a0 - Les Tutoriels\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Installer une signature HTML dans Apple Mail sur macOS\" \/>\n\t\t<meta property=\"og:description\" content=\"Mail.app sur macOS synchronise les signatures via iCloud Drive. 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Tant que cette synchronisation est active, tout fichier .mailsignature\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/www.varcap-informatique.net\/tutoriels\/wp-content\/uploads\/2026\/06\/Mail_Apple_logo.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BlogPosting\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/installer-une-signature-html-dans-apple-mail-sur-macos\\\/#blogposting\",\"name\":\"Installer une signature HTML dans Apple Mail sur macOS\",\"headline\":\"Installer une signature HTML dans Apple Mail sur macOS\",\"author\":{\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/author\\\/arnault75\\\/#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/#organization\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Mail_Apple_logo.png\",\"width\":300,\"height\":300,\"caption\":\"logo mail Apple\"},\"datePublished\":\"2026-06-29T16:31:40+01:00\",\"dateModified\":\"2026-06-29T16:32:18+01:00\",\"inLanguage\":\"fr-FR\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/installer-une-signature-html-dans-apple-mail-sur-macos\\\/#webpage\"},\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/installer-une-signature-html-dans-apple-mail-sur-macos\\\/#webpage\"},\"articleSection\":\"Apple Mail\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/installer-une-signature-html-dans-apple-mail-sur-macos\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels#listItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/category\\\/apple-3\\\/#listItem\",\"name\":\"Apple\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/category\\\/apple-3\\\/#listItem\",\"position\":2,\"name\":\"Apple\",\"item\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/category\\\/apple-3\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.varcap-informatique.net\\\/tutoriels\\\/category\\\/apple-3\\\/macbook\\\/#listItem\",\"name\":\"MacBook, iMac &amp; 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