{"id":5409,"date":"2025-03-25T13:39:48","date_gmt":"2025-03-25T11:39:48","guid":{"rendered":"https:\/\/norttipaikalle.fi\/?p=5409"},"modified":"2026-02-26T22:55:39","modified_gmt":"2026-02-26T20:55:39","slug":"spf-dkim-and-dmarc-dns-records-making-email-better","status":"publish","type":"post","link":"https:\/\/norttipaikalle.fi\/fi\/spf-dkim-and-dmarc-dns-records-making-email-better\/","title":{"rendered":"SPF, DKIM ja DMARC: DNS-tietueet, joilla varmistetaan, ett\u00e4 s\u00e4hk\u00f6posti tulee perille."},"content":{"rendered":"<div class=\"wp-block-group alignwide has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Et ole varmaan koskaan n\u00e4hnyt n\u00e4in paljon anakronismia samassa paikassa!  Puretaanpa nopeasti SPF-, DKIM- ja DMARC DNS-tietueet.<\/p>\n\n\n\n<p>Ajattele DNS:\u00e4\u00e4 internetin osoitekirjana. Se auttaa ohjaamaan erityyppist\u00e4 liikennett\u00e4, kuten verkkopyynt\u00f6j\u00e4 tai s\u00e4hk\u00f6postia, oikeille palvelimille. Mit\u00e4 meihin tulee, SPF-, DKIM- ja DMARC-tietojen DNS-tietueet ovat kaikki TXT-tietuetyyppej\u00e4.<\/p>\n\n\n\n<p>SPF, DKIM ja DMARC toimivat yhdess\u00e4, jotta s\u00e4hk\u00f6posti pysyy turvallisena ja roskapostittomana.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div data-mode=\"normal\" data-oembed=\"1\" data-provider=\"youtube\" id=\"arve-youtube-iug31axlxyw\" style=\"max-width:400px;\" class=\"arve aligncenter\">\n\t<div class=\"arve-inner\">\n\t\t<div style=\"aspect-ratio:500\/281\" class=\"arve-embed arve-embed--has-aspect-ratio\">\n\t\t\t<div class=\"arve-ar\" style=\"padding-top:56.200000%\"><\/div>\n\t\t\t<iframe allow=\"accelerometer &apos;none&apos;;autoplay &apos;none&apos;;bluetooth &apos;none&apos;;browsing-topics &apos;none&apos;;camera &apos;none&apos;;clipboard-read &apos;none&apos;;clipboard-write;display-capture &apos;none&apos;;encrypted-media &apos;none&apos;;gamepad &apos;none&apos;;geolocation &apos;none&apos;;gyroscope &apos;none&apos;;hid &apos;none&apos;;identity-credentials-get &apos;none&apos;;idle-detection &apos;none&apos;;keyboard-map &apos;none&apos;;local-fonts;magnetometer &apos;none&apos;;microphone &apos;none&apos;;midi &apos;none&apos;;otp-credentials &apos;none&apos;;payment &apos;none&apos;;picture-in-picture;publickey-credentials-create &apos;none&apos;;publickey-credentials-get &apos;none&apos;;screen-wake-lock &apos;none&apos;;serial &apos;none&apos;;summarizer &apos;none&apos;;sync-xhr;usb &apos;none&apos;;web-share;window-management &apos;none&apos;;xr-spatial-tracking &apos;none&apos;;\" allowfullscreen=\"\" class=\"arve-iframe fitvidsignore\" credentialless data-arve=\"arve-youtube-iug31axlxyw\" data-lenis-prevent=\"\" data-src-no-ap=\"https:\/\/www.youtube-nocookie.com\/embed\/Iug31aXlXYw?feature=oembed&amp;iv_load_policy=3&amp;modestbranding=1&amp;rel=0&amp;autohide=1&amp;playsinline=0&amp;autoplay=0\" frameborder=\"0\" height=\"224.8\" loading=\"lazy\" name=\"\" referrerpolicy=\"strict-origin-when-cross-origin\" sandbox=\"allow-scripts allow-same-origin allow-presentation allow-popups allow-popups-to-escape-sandbox\" scrolling=\"no\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/Iug31aXlXYw?feature=oembed&#038;iv_load_policy=3&#038;modestbranding=1&#038;rel=0&#038;autohide=1&#038;playsinline=0&#038;autoplay=0\" title=\"\" width=\"400\"><\/iframe>\n\t\t\t\n\t\t<\/div>\n\t\t\n\t<\/div>\n\t\n\t\n\t<script type=\"application\/ld+json\">{\"@context\":\"http:\\\/\\\/schema.org\\\/\",\"@id\":\"https:\\\/\\\/norttipaikalle.fi\\\/fi\\\/spf-dkim-and-dmarc-dns-records-making-email-better\\\/#arve-youtube-iug31axlxyw\",\"type\":\"VideoObject\",\"embedURL\":\"https:\\\/\\\/www.youtube-nocookie.com\\\/embed\\\/Iug31aXlXYw?feature=oembed&iv_load_policy=3&modestbranding=1&rel=0&autohide=1&playsinline=0&autoplay=0\"}<\/script>\n\t\n<\/div>\n\n\n<p>In this video I explain in simple terms what these records are, and why they are important.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-container-core-group-is-layout-e603688c wp-block-group-is-layout-flow\" style=\"border-style:none;border-width:0px;margin-top:0;margin-bottom:0;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0;box-shadow:none\">\n<script data-id=\"tp_2MhoDB\" data-token=\"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.WAB-IIDAPJYeY2USgZknXOYtwdj-UvIUhbYvqQoCBVY\" src=\"https:\/\/easydmarc.com\/tools\/domain-scanner\/embedjs\/1.0.0\"><\/script>\n<\/div>\n<\/div>\n<\/div>\n\n\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">SPF<\/h2>\n\n\n\n<p>T\u00e4m\u00e4 on periaatteessa luettelo palvelimista, jotka saavat l\u00e4hett\u00e4\u00e4 s\u00e4hk\u00f6postia nimiss\u00e4si.  T\u00e4m\u00e4 ei ole sama asia kuin s\u00e4hk\u00f6postin l\u00e4hett\u00e4minen puhelimesta, kannettavasta tietokoneesta tai webmailista.  N\u00e4m\u00e4 kaikki ovat yhteydess\u00e4 samaan s\u00e4hk\u00f6postipalvelimeen.  SPF-tietueet viittaavat yleens\u00e4 seuraaviin esimerkkeihin s\u00e4hk\u00f6postipalvelimista:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ensisijainen s\u00e4hk\u00f6postipalvelimesi (esim. s\u00e4hk\u00f6postipalveluntarjoajan SMTP-palvelin).\n<ul class=\"wp-block-list\">\n<li>Verkkosivuston hosting-yritys<\/li>\n\n\n\n<li>Microsoft<\/li>\n\n\n\n<li>Google jne.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Postituslistoja varten k\u00e4ytt\u00e4m\u00e4si alusta\n<ul class=\"wp-block-list\">\n<li>Mailchimp<\/li>\n\n\n\n<li>Kajabi<\/li>\n\n\n\n<li>Sender jne.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Examples<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>v=spf1 include:sendersrv.com include:relay.k.io ~all<\/code><\/pre>\n\n\n\n<p>T\u00e4st\u00e4 n\u00e4emme esimerkiksi, ett\u00e4 s\u00e4hk\u00f6postin l\u00e4hett\u00e4minen nimell\u00e4ni sallitaan palvelimilla, joiden osoitteet ovat sendersrv.com ja relay.k.io, ja ett\u00e4 \"kaikkiin\" s\u00e4hk\u00f6posteihin sovelletaan \"soft-fail\" -k\u00e4yt\u00e4nt\u00f6\u00e4 (merkitty ~-symbolilla), mik\u00e4 tarkoittaa, ett\u00e4 SPF-testin l\u00e4p\u00e4isseet s\u00e4hk\u00f6postiviestit merkit\u00e4\u00e4n ep\u00e4onnistuneiksi, mutta niiden sallitaan siirty\u00e4 vastaanottajan postilaatikkoon.  Hard fail -k\u00e4yt\u00e4nt\u00f6 ( - ) aiheuttaisi riskin, ett\u00e4 hyl\u00e4t\u00e4\u00e4n s\u00e4hk\u00f6postiviestit, jotka ovat kelvollisia, mutta jotka on l\u00e4hetetty eteenp\u00e4in joltakulta muulta taholta.<\/p>\n\n\n\n<p>sendersrv.com on uutiskirjeiden l\u00e4hett\u00e4miseen k\u00e4ytetty alusta, ja relay.k.io viittaa kyseisen verkkosivuston hosting-yrityksen s\u00e4hk\u00f6postipalvelimeen.<\/p>\n\n\n\n<p>For instance, if a spammer sends an email from their own server in your name, their email server won&#8217;t be listed in the SPF record. If an email is sent from a server not listed in your SPF record, the recipient\u2019s email system can flag it as suspicious or reject it based on the DMARC policy (see below).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"spf-hardfail-example\">SPF hardfail example<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>v=spf1 ip4:192.168.0.1 -all<\/code><\/pre>\n\n\n\n<p>In the provided example, the minus symbol (in front of all at the end of the record) indicates that any senders not listed in this SPF record should be treated as a hardfail. This means they are unauthorised, and emails from them should be discarded. In this case, only the IP address 192.168.0.1 is authorised to send emails, and nothing else.<\/p>\n\n\n\n<p>This means that there is a strong risk that legitimate emails which are forwarded or auto-redirected will fail, since the forwarding server won&#8217;t match the sending server.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"spf-softfail-example\">SPF softfail example<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>v=spf1 include:spf.protection.outlook.com ~all<\/code><\/pre>\n\n\n\n<p>In the example above, the tilde symbol (in front of all at the end of the record) means that any senders not listed in this SPF record should be treated as a softfail. This means that the mail can be allowed through, but it\u2019ll be tagged as spam or suspicious. In this case, the include:spf.protection.outook.com mechanism gave Microsoft 365 the green light to send emails. Any emails coming from different servers will be marked as spam by the receivers. <\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">DKIM<\/h2>\n\n\n\n<p>T\u00e4m\u00e4 TXT-tietue sis\u00e4lt\u00e4\u00e4 digitaalisen allekirjoituksen, joka lis\u00e4t\u00e4\u00e4n s\u00e4hk\u00f6postin otsikoihin.  Allekirjoitus luodaan yksityisell\u00e4 avaimella, ja vastaanottajat voivat tarkistaa sen l\u00e4hett\u00e4j\u00e4n DNS-tietueissa julkaistun julkisen avaimen avulla. N\u00e4in varmistetaan, ett\u00e4 s\u00e4hk\u00f6postin on todellakin l\u00e4hett\u00e4nyt se verkkotunnus, jolta se v\u00e4itet\u00e4\u00e4n l\u00e4hetetyksi, ja ett\u00e4 sen sis\u00e4lt\u00f6\u00e4 ei ole muutettu kuljetuksen aikana.<\/p>\n\n\n\n<p>DKIM-tietueen sis\u00e4lt\u00f6 voi osittain n\u00e4ytt\u00e4\u00e4 t\u00e4lt\u00e4:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3YBSWpiwQtktDgdZOxoB\/LwBHOsafxXTqMV9TFgkNo2gkfiHznZKGBOlXIyqE9bALvyaLARUWOTYHyG4dWKLdPTOy2MLnD48h3F7OQmzCYRJkJ\/a+xvWqeXu5UjqWvilSopUVkXHNE1Wl1F+oHbjr+jUvu0iZE7637Jx ........<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">DMARC<\/h2>\n\n\n\n<p>DMARC-tietue kertoo vastaanottajan s\u00e4hk\u00f6postipalvelimelle, miten SPF- tai DKIM-tarkistukset ep\u00e4onnistuvat s\u00e4hk\u00f6postiviesteiss\u00e4.<\/p>\n\n\n\n<p>Laiskin vastaus, jonka se voi saada, on \"meh ... \ud83e\udd37\ud83c\udffc\".<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>v=DMARC1; p=none;<\/code><\/pre>\n\n\n\n<p>\"p\"-merkki tarkoittaa politiikkaa, ja t\u00e4ss\u00e4 tapauksessa sit\u00e4 ei ole.  T\u00e4m\u00e4 periaatteessa vain kertoo vastaanottajapalvelimelle: \"Anna s\u00e4hk\u00f6postin menn\u00e4 l\u00e4pi. Jos se on huijausta ( \ud83d\ude09 ), k\u00e4yt\u00e4 vain parasta harkintaasi.\"<\/p>\n\n\n\n<p>DMARC-tietueen paljon viisaampi k\u00e4ytt\u00f6 voisi olla seuraavanlainen:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>v=DMARC1; p=quarantine; pct=50; rua=mailto:dmarc-reports@example.com;<\/code><\/pre>\n\n\n\n<p class=\"has-text-align-right has-text-color has-link-color wp-elements-ddf123f3952215cd9e67b0659d70323d\" style=\"color:#696969\"><em>L\u00e4hde: <a href=\"https:\/\/www.emailtooltester.com\/en\/blog\/dmarc-record-example\/\">https:\/\/www.emailtooltester.com\/en\/blog\/dmarc-record-example\/<\/a><\/em><\/p>\n\n\n\n<p>T\u00e4m\u00e4 k\u00e4skee vastaanottajapalvelinta soveltamaan k\u00e4yt\u00e4nt\u00f6\u00e4 50 prosenttiin s\u00e4hk\u00f6posteista, jotka eiv\u00e4t l\u00e4p\u00e4ise SPF- ja DKIM-tarkistuksia: Karanteeniin ja l\u00e4hett\u00e4m\u00e4\u00e4n ep\u00e4onnistumisraportit osoitteeseen dmarc-reports@example.com.<\/p>\n\n\n\n<p>Ihanteellinen tietue olisi seuraavanlainen:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>v=DMARC1; p=reject; pct=100; rua=mailto:dmarc-reports@example.com; ruf=mailto:dmarc-fails@example.com;<\/code><\/pre>\n\n\n\n<p>When applying policy other than &#8220;none&#8221;, important to be sending the reports. Without reporting (and actually reading those reports), you will have no way to know how effective your settings are, and if legitimate emails are getting blocked by accident.<\/p>\n\n\n\n<p>\ud83d\udd17 <a href=\"https:\/\/norttipaikalle.fi\/business-it-solutions\/email-security-monitoring-and-response\/\">My DMARC monitoring service handles this for you<\/a>.<\/p>\n\n\n\n<p>Se, miten tiukasti teet asioista, riippuu sinusta itsest\u00e4si ja my\u00f6s siit\u00e4, kuinka paljon energiaa sinulla on henkil\u00f6kohtaisesti raporttien l\u00e4pik\u00e4ymiseen, ja kokemukseni mukaan se vaatii ty\u00f6kaluja, jotka ratkaisevat. Voit k\u00e4ytt\u00e4\u00e4 ty\u00f6kaluja osoitteessa  <a href=\"https:\/\/mxtoolbox.com\/dmarc.aspx\">MXToolbox.com<\/a> for this.<\/p>\n<\/div>\n\n\n\n\n\n<div style=\"height:70px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group has-border-color has-nv-text-dark-bg-border-color has-accent-5-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-f90d3be4 wp-block-group-is-layout-constrained\" style=\"border-width:1px;border-radius:40px;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--30)\">\n<h2 class=\"wp-block-heading has-text-align-center has-accent-5-background-color has-background\" style=\"font-size:clamp(20.515px, 1.282rem + ((1vw - 3.2px) * 1.058), 33px);\">Would you like me handle all this for you?<\/h2>\n\n\n\n<div class=\"wp-block-group alignwide is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-23441af8 wp-block-group-is-layout-flex\">\n<div class=\"wp-block-sender-sender-forms sender-form-field\" data-sender-form-id=\"magm1btqdypmwreutsm\"><\/div>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>","protected":false},"excerpt":{"rendered":"<p>DNS is the address book of the internet.  Use  the SPF, DKIM, and DMARC records to  keep your email domain secure and from being abused by scammers.<\/p>","protected":false},"author":1,"featured_media":5417,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"SPF, DKIM, and DMARC are all types of DNS records which help make sure your email arrive safely whilst reducing spam.  Let me help you achieve this. \ud83d\udce7\ud83d\ude80","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":true,"token":"eyJpbWciOiJodHRwczpcL1wvbm9ydHRpcGFpa2FsbGUuZmlcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjVcLzAzXC9wZXhlbHMtcGhvdG8tMTkzMDAzLWUxNzQyOTAzMTA3OTA2LTEwMjR4NjE0LmpwZWciLCJ0eHQiOiJTUEYsIERLSU0sIGFuZCBETUFSQzogRE5TIHJlY29yZHMgdG8gbWFrZSBzdXJlIGVtYWlsIGFycml2ZXMiLCJ0ZW1wbGF0ZSI6ImhpZ2h3YXkiLCJmb250IjoiIiwiYmxvZ19pZCI6MjE2NjczNTYzfQ.gv7x0DaAzHSSQUqShQQXcP4DOvgQsfrddZFKMgXPL90MQ"},"version":2},"_wpas_customize_per_network":false},"categories":[42,1,90,37],"tags":[175,177,114,91,174],"class_list":["post-5409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practice","category-blog","category-business","category-tips-and-tricks","tag-dkim","tag-dmarc","tag-email","tag-it-security","tag-spf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SPF, DKIM, and DMARC: DNS records to make sure email arrives &#8211; 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