{"id":7716,"date":"2022-04-08T16:28:36","date_gmt":"2022-04-08T14:28:36","guid":{"rendered":"https:\/\/www.websupport.cz\/podpora\/?post_type=ht_kb&#038;p=7716"},"modified":"2022-04-08T16:34:14","modified_gmt":"2022-04-08T14:34:14","slug":"dmarc","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/","title":{"rendered":"DMARC"},"content":{"rendered":"\n<p><strong>DMARC<\/strong>\u00a0(Domain-based Message Authentication, Reporting and Conformance) je specifikace, kter\u00e1 umo\u017e\u0148uje propojit dv\u011b technologie autentifikace SPF a DKIM a informovat server p\u0159ij\u00edmaj\u00edc\u00ed zpr\u00e1vu o tom, jak\u00e1 pravidla m\u00e1 aplikovat na zpr\u00e1vy z ur\u010dit\u00e9 dom\u00e9ny.\u00a0<\/p>\n\n\n\n<p><strong>DKIM<\/strong>\u00a0\u2013 zaob\u00edr\u00e1 se obsahem emailu, m\u016f\u017ee ho v\u0161ak podepsat t\u00e9m\u011b\u0159 kdokoliv. Pokud se poda\u0159\u00ed ov\u011b\u0159it DKIM podpis, z\u016fst\u00e1v\u00e1 je\u0161t\u011b ot\u00e1zka, jestli se m\u016f\u017ee v\u011b\u0159it podepisuj\u00edc\u00edmu.<\/p>\n\n\n\n<p><strong>SPF<\/strong>\u00a0\u2013 ov\u011b\u0159uje odes\u00edlac\u00ed server a vych\u00e1z\u00ed z informac\u00ed odevzdan\u00fdch protokolem SMTP. Ty se v\u0161ak nemus\u00ed shodovat s t\u00edm, co je napsan\u00e9 v hlavi\u010dk\u00e1ch emailu.<\/p>\n\n\n\n<p><strong>DMARC<\/strong>\u00a0na tyto dv\u011b technologie navazuje, kombinuje je a m\u00e1 n\u00e1sleduj\u00edc\u00ed kl\u00ed\u010dov\u00e9 vlastnosti:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Vych\u00e1z\u00ed z adresy odesilatele uveden\u00e9 v hlavi\u010dce From emailu a sna\u017e\u00ed se ov\u011b\u0159it, jestli email byl skute\u010dn\u011b odeslan\u00fd z uveden\u00e9 dom\u00e9ny.<\/li><li>Vyu\u017e\u00edv\u00e1 SPF a DKIM \u2013 pokud bylo spln\u011bn\u00e9 SPF odesilatelovy dom\u00e9ny nebo email nese jej\u00ed ov\u011b\u0159en\u00fd DKIM podpis, pova\u017euje ji za d\u016fv\u011bryhodnou.<\/li><li>Definuje politiku pro ne\u00fasp\u011b\u0161n\u00e9 emaily \u2013 jak se zachovat k t\u011bm, kter\u00e9 DMARC ov\u011b\u0159en\u00edm neprojdou.<\/li><li>Umo\u017e\u0148uje nastavit zp\u011btnou vazbu \u2013 kam a jak pos\u00edlat zpr\u00e1vy o v\u00fdsledc\u00edch DMARC pro emaily (\u00fadajn\u011b) odeslan\u00e9 z dan\u00e9 dom\u00e9ny.<\/li><li>M\u016f\u017eete nastavit, \u017ee se m\u00e1 uplat\u0148ovat jen pro \u010d\u00e1st email\u016f a nasazovat je postupn\u011b.<\/li><li>DMARC zve\u0159ej\u0148uje dr\u017eitel odes\u00edlac\u00ed dom\u00e9ny a ov\u011b\u0159uje p\u0159\u00edjemce emailu<\/li><\/ul>\n\n\n\n<p>Je d\u016fle\u017eit\u00e9, \u017ee DMARC nen\u00ed jen samostatnou technologi\u00ed, navazuje pr\u00e1v\u011b na existuj\u00edc\u00ed SPF a DKIM. T\u011bmi si p\u0159\u00edjemce ov\u011b\u0159\u00ed, jestli email vyhov\u011bl pravidl\u016fm pro odesl\u00e1n\u00ed z dom\u00e9ny podle mail from z SMTP a ze kter\u00fdch dom\u00e9n m\u00e1 platn\u00e9 podpisy. Tyto informace se potom zas\u00edlaj\u00ed do modulu DMARC, kter\u00fd porovn\u00e1v\u00e1 a zkoum\u00e1, jestli dom\u00e9ny ov\u011b\u0159en\u00e9 v SPF nebo DKIM maj\u00ed n\u011bco spole\u010dn\u00e9ho z uveden\u00e9 dom\u00e9ny v hlavi\u010dce from. Pokud alespo\u0148 jedna \u010d\u00e1st je pravdiv\u00e1, tak se podle DMARC d\u00e1 v\u011b\u0159it tomu, \u017ee email byl opravdu odeslan\u00fd z dan\u00e9 dom\u00e9ny.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"nastavenie-dmarc\">Nastaven\u00ed DMARC<\/h2>\n\n\n\n<p>DMARC aktivujeme p\u0159id\u00e1n\u00edm DNS z\u00e1znamu typu TXT<\/p>\n\n\n\n<p>Z\u00e1znam:\u00a0<strong>_dmarc<\/strong><br>Text:\u00a0<strong>v=DMARC1; p=none; rua=mailto:reporty@vasedomena.cz<\/strong><br>TTL:\u00a0<strong>3600<\/strong><\/p>\n\n\n\n<p>V tomto TXT z\u00e1znamu m\u016f\u017eete pou\u017e\u00edt n\u011bkolik parametr\u016f upravuj\u00edc\u00edch fungov\u00e1n\u00ed DMARC.<\/p>\n\n\n\n<p><strong>\u201ev\u201c<\/strong>\u00a0\u2013 verze protokolu, v sou\u010dasnosti m\u016f\u017eeme pou\u017e\u00edt pouze hodnotu DMARC1<\/p>\n\n\n\n<p><strong>\u201ep\u201c<\/strong>\u00a0\u2013 po\u017eadovan\u00e1 akce p\u0159\u00edjemce, tedy jak m\u00e1 p\u0159\u00edjemce nalo\u017eit se zpr\u00e1vou, kter\u00e1 ne\u00fasp\u011b\u0161n\u011b pro\u0161la kontrolou SPF a DKIM. M\u016f\u017eete nastavit n\u00e1sleduj\u00edc\u00ed hodnoty:<\/p>\n\n\n\n<p><strong>none<\/strong>\u00a0\u2013 p\u0159\u00edjemce nevykon\u00e1 \u017e\u00e1dnou akci nav\u00edc, standardn\u011b si tedy vykon\u00e1 kontroly SPF a DKIM a na z\u00e1klad\u011b t\u011bchto a dal\u0161\u00edch v\u00fdsledk\u016f potom vyhodnot\u00ed d\u016fv\u011bryhodnost zpr\u00e1vy a zpracuje ji podle vlastn\u00edch pravidel<br><strong>quarantine<\/strong>\u00a0\u2013 p\u0159\u00edjemce dostane zpr\u00e1vu ozna\u010denou jako ur\u010denou do karant\u00e9ny a podle sv\u00fdch pravidel s n\u00ed nalo\u017e\u00ed, nap\u0159\u00edklad ji p\u0159esune do nevy\u017e\u00e1dan\u00e9 po\u0161ty<br><strong>reject<\/strong>\u00a0\u2013 p\u0159\u00edjemce v tomto p\u0159\u00edpad\u011b odm\u00edtne doru\u010den\u00ed zpr\u00e1vy, v\u016fbec tedy nedoraz\u00ed do c\u00edlov\u00e9ho mailboxu.<\/p>\n\n\n\n<p><strong>\u201erua\u201c<\/strong>\u00a0\u2013 e-mailov\u00e1 adresa pro zas\u00edl\u00e1n\u00ed agregovan\u00fdch report\u016f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"generovanie-zaznamu-cez-mxtoolbox\">Generov\u00e1n\u00ed z\u00e1znamu p\u0159es mxtoolbox<\/h2>\n\n\n\n<p><strong>DMARC z\u00e1znam si m\u016f\u017eete i jednodu\u0161e vygenerovat.<\/strong>\u00a0Na str\u00e1nce\u00a0<a href=\"https:\/\/mxtoolbox.com\/DMARCRecordGenerator.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">mxtoolbox<\/a>\u00a0si zad\u00e1me n\u00e1zev dom\u00e9ny pro kterou chcete DMARC nastavit a klikneme na \u201eCheck DMARC record\u201c. Na lev\u00e9 stran\u011b si nastavujeme jednotliv\u00e9 parametry podle v\u00fdpisu v\u00fd\u0161e a na prav\u00e9 stran\u011b se n\u00e1m z\u00e1znam automaticky aktualizuje podle zadan\u00fdch parametr\u016f.<\/p>\n\n\n\n<p>Hotov\u00fd \u201esuggested record\u201c zkop\u00edrujeme a vytvo\u0159\u00edme nov\u00fd TXT z\u00e1znam ve\u00a0<a href=\"https:\/\/admin.websupport.cz\/\" target=\"_blank\" rel=\"noreferrer noopener\">Webadminu<\/a>\u00a0podle tohoto\u00a0<a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/txt-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">n\u00e1vodu<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/2022\/03\/DMARC-783x227.png\" alt=\"dmarc\" class=\"wp-image-22047\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>DMARC\u00a0(Domain-based Message Authentication, Reporting and Conformance) je specifikace, kter\u00e1 umo\u017e\u0148uje propojit dv\u011b technologie autentifikace SPF a DKIM a informovat server p\u0159ij\u00edmaj\u00edc\u00ed zpr\u00e1vu o tom, jak\u00e1 pravidla m\u00e1 aplikovat na zpr\u00e1vy z ur\u010dit\u00e9 dom\u00e9ny.\u00a0 DKIM\u00a0\u2013 zaob\u00edr\u00e1 se obsahem emailu, m\u016f\u017ee ho v\u0161ak podepsat t\u00e9m\u011b\u0159 kdokoliv. Pokud se poda\u0159\u00ed ov\u011b\u0159it DKIM podpis,&#8230;<\/p>\n","protected":false},"author":5,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[12],"ht-kb-tag":[],"class_list":["post-7716","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-dns-zaznamy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DMARC - Websupport Centrum n\u00e1pov\u011bdy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DMARC - Websupport Centrum n\u00e1pov\u011bdy\" \/>\n<meta property=\"og:description\" content=\"DMARC\u00a0(Domain-based Message Authentication, Reporting and Conformance) je specifikace, kter\u00e1 umo\u017e\u0148uje propojit dv\u011b technologie autentifikace SPF a DKIM a informovat server p\u0159ij\u00edmaj\u00edc\u00ed zpr\u00e1vu o tom, jak\u00e1 pravidla m\u00e1 aplikovat na zpr\u00e1vy z ur\u010dit\u00e9 dom\u00e9ny.\u00a0 DKIM\u00a0\u2013 zaob\u00edr\u00e1 se obsahem emailu, m\u016f\u017ee ho v\u0161ak podepsat t\u00e9m\u011b\u0159 kdokoliv. 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Pokud se poda\u0159\u00ed ov\u011b\u0159it DKIM podpis,...","og_url":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/","og_site_name":"Websupport Centrum n\u00e1pov\u011bdy","article_modified_time":"2022-04-08T14:34:14+00:00","og_image":[{"url":"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/2022\/03\/DMARC-783x227.png","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_misc":{"Odhadovan\u00e1 doba \u010dten\u00ed":"3 minuty"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/","url":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/","name":"DMARC - Websupport Centrum n\u00e1pov\u011bdy","isPartOf":{"@id":"https:\/\/www.websupport.cz\/podpora\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/#primaryimage"},"image":{"@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/#primaryimage"},"thumbnailUrl":"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/2022\/03\/DMARC-783x227.png","datePublished":"2022-04-08T14:28:36+00:00","dateModified":"2022-04-08T14:34:14+00:00","breadcrumb":{"@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/#breadcrumb"},"inLanguage":"cs","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/"]}]},{"@type":"ImageObject","inLanguage":"cs","@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/#primaryimage","url":"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/2022\/03\/DMARC-783x227.png","contentUrl":"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/2022\/03\/DMARC-783x227.png"},{"@type":"BreadcrumbList","@id":"https:\/\/www.websupport.cz\/podpora\/kb\/dmarc\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.websupport.cz\/podpora\/"},{"@type":"ListItem","position":2,"name":"DMARC"}]},{"@type":"WebSite","@id":"https:\/\/www.websupport.cz\/podpora\/#website","url":"https:\/\/www.websupport.cz\/podpora\/","name":"Websupport Centrum n\u00e1pov\u011bdy","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.websupport.cz\/podpora\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"cs"}]}},"_links":{"self":[{"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb\/7716","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/users\/5"}],"version-history":[{"count":2,"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb\/7716\/revisions"}],"predecessor-version":[{"id":7722,"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb\/7716\/revisions\/7722"}],"wp:attachment":[{"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/media?parent=7716"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb-category?post=7716"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/www.websupport.cz\/podpora\/wp-json\/wp\/v2\/ht-kb-tag?post=7716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}