{"id":156921,"date":"2026-07-02T17:21:35","date_gmt":"2026-07-02T08:21:35","guid":{"rendered":"https:\/\/support.questetra.com\/?p=156921"},"modified":"2026-08-05T13:52:04","modified_gmt":"2026-08-05T04:52:04","slug":"sender-domain-authentication","status":"publish","type":"post","link":"https:\/\/support.questetra.com\/en\/developer-blog\/sender-domain-authentication\/","title":{"rendered":"Countermeasures Against Spoofing Emails in Questetra BPM Suite"},"content":{"rendered":"\n<p class=\"is-style-info wp-block-paragraph\">2024-01-23: Published<br>2024-07-16: Modifications for supporting DKIM settings in any domain (adding links, etc.)<br>2026-07-02: Added explanation regarding DMARC<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many people have been harmed by email spoofing in recent years. Therefore, email senders must have measures in place to prevent this*. The following sender domain authentication is a countermeasure against spoofing emails that can be implemented by email senders.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPF \u201cSender Policy Framework\u201d<gwmw style=\"display:none;\"><\/gwmw>\n<ul class=\"wp-block-list\">\n<li>Verifies the sender domain based on the IP address of the sending mail server<gwmw style=\"display:none;\"><\/gwmw><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>DKIM \u201cDomainKeys Identified Mail\u201d\n<ul class=\"wp-block-list\">\n<li>Digitally sign and validate outgoing emails<gwmw style=\"display:none;\"><\/gwmw><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>DMARC \u201cDomain-based Message Authentication, Reporting, and Conformance\u201d<gwmw style=\"display:none;\"><\/gwmw>\n<ul class=\"wp-block-list\">\n<li>Defines how receiving servers should handle emails that fail SPF \/ DKIM authentication<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"is-style-info wp-block-paragraph\">*For example, Gmail has these guidelines<br><a href=\"https:\/\/support.google.com\/a\/answer\/81126?visit_id=638411496872927026-516173783&amp;rd=1&amp;hl=en&amp;sjid=17905996144087956543-AP\">Gmail Help &#8220;Email sender guidelines&#8221;<\/a><br><br>According to the guidelines, all senders must support either SPF or DKIM. In addition, senders who send more than 5,000 messages per day must support both SPF and DKIM after February 1, 2024.<br><br>Since it is not possible to send a large number of emails from Questetra BPM Suite, it is not expected to fall into this category of &#8220;senders who send more than 5,000 emails per day&#8221; in normal use.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sender Domain Authentication in Questetra BPM Suite<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In Questetra, emails can be sent using automated steps in the workflow. If the user does not specify a From address, it is set to &#8220;no-reply@s.questetra.net&#8221; by default.&nbsp;<gwmw style=\"display:none;\"><\/gwmw><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM signatures are implemented with the questetra.net domain*, so emails are sent with a first-party signature. On the other hand, if the From address is changed, the DKIM signature with the questetra.net domain is still added, but it is treated as a third-party signature.<\/p>\n\n\n\n<p class=\"is-style-info wp-block-paragraph\">*In fact, the DKIM signature will be on the &#8220;s.questetra.net&#8221; domain. Also, in the trial version of workflow platform, the From address is &#8220;no-reply@f.questetra.net&#8221; and the DKIM signature is in the f.questetra.net domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The SPF setting is our recommendation for users who specify an email address as their From address when sending emails.<gwmw style=\"display:none;\"><\/gwmw><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/throwing-message-intermediate-event-email-dynamic-recipients\/\">Let`s Send an Email Automatically in the Middle of a Workflow (Address embed chapter)<\/a><gwmw style=\"display:none;\"><\/gwmw><\/li>\n\n\n\n<li><a href=\"https:\/\/questetra.zendesk.com\/hc\/en-us\/articles\/360024331172-R2241-SPF-Setting?_ga=2.234772765.2052499089.1705882122-1410706202.1689813786&amp;_gl=1%2Atw02rg%2A_ga%2AMTQxMDcwNjIwMi4xNjg5ODEzNzg2%2A_ga_9BFBCV3L69%2AMTcwNTg4OTU0MC4xMTkuMS4xNzA1ODkwOTIwLjU0LjAuMA..\">R2241: SPF Setting<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">DKIM Signing with Custom Domains<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM signing (sender signing) is also available using a custom domain specified by the user.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Specifically, Questetra users (system administrators) can register the private key of the sender\u2019s domain in their workflow platform (Advanced Edition and above). This allows DKIM signing (first-party signature) to be performed using the registered private key when an email is sent with a From address that uses the specified domain. In addition, by properly configuring and operating SPF \/ DKIM, DMARC compliance is also possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Controlling Email Authentication Policies with DMARC<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is DMARC?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a mechanism that instructs receiving mail servers on how to handle emails (allow, quarantine, or reject) based on SPF and DKIM authentication results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While SPF and DKIM alone cannot control the behavior when authentication fails, configuring DMARC allows you to explicitly define policies and prevent spoofed emails.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Integrated evaluation of SPF\/DKIM results<\/li>\n\n\n\n<li>Policy specification for authentication failures (none \/ quarantine \/ reject)<\/li>\n\n\n\n<li>Visualization of sending status via reports<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How to Configure DMARC<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DMARC is configured by adding a TXT record to DNS. The target for configuration is the \u201c_dmarc\u201d subdomain of the sending domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Basic Configuration Example<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism off-numbers lang-plain\"><code>v=DMARC1; p=none; rua=mailto:dmarc-report@example.com<\/code><\/pre><\/div>\n\n\n\n<dl>\n  <dt>v<\/dt>\n  <dd>DMARC version (fixed as DMARC1)<\/dd>\n  <dt>p<\/dt>\n  <dd>Policy (none \/ quarantine \/ reject)\n    <ul>\n      <li>none: Monitoring only (no impact)<\/li>\n      <li>quarantine: Treated as spam<\/li>\n      <li>reject: Rejected<\/li>\n    <\/ul>\n  <\/dd>\n  <dt>rua<\/dt>\n  <dd>Email address to send aggregate reports to<\/dd>\n<\/dl>\n\n\n\n<h4 class=\"wp-block-heading\">Setup Procedure<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Verify that SPF and DKIM are configured correctly<\/li>\n\n\n\n<li>Add a TXT record for the \u201c_dmarc\u201d subdomain to DNS<\/li>\n\n\n\n<li>Start operations with p=none\n<ul class=\"wp-block-list\">\n<li>Setting it to reject immediately may cause legitimate emails to be blocked<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Gradually strengthen the policy while monitoring the reports<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">For DMARC to be valid, either the SPF or DKIM must match (or be within the allowed tolerance) the domain of the \u201cFrom\u201d address. If using a third-party sending service, please ensure consistency with the \u201cFrom\u201d domain.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Questetra remains committed to continuously developing and improving its features so that Questetra users can use their workflow platform in a safe, secure, and convenient manner.<gwmw style=\"display:none;\"><\/gwmw><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Describes how to support the Sender Domain Authentication technology, which is an effective countermeasure against spoofing emails when sending emails from Questetra.<\/p>\n","protected":false},"author":3,"featured_media":156950,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_uag_custom_page_level_css":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[296],"tags":[],"faq_section":[],"class_list":["post-156921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developer-blog"],"jetpack_publicize_connections":[],"uagb_featured_image_src":{"full":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=1200%2C675&ssl=1",1200,675,false],"thumbnail":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=440%2C440&ssl=1",440,440,true],"medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=560%2C315&ssl=1",560,315,true],"medium_large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=768%2C432&ssl=1",768,432,true],"large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=1024%2C576&ssl=1",1024,576,true],"1536x1536":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=1200%2C675&ssl=1",1200,675,true],"2048x2048":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?fit=1200%2C675&ssl=1",1200,675,true],"newspack-article-block-landscape-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=1200%2C675&ssl=1",1200,675,true],"newspack-article-block-portrait-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=900%2C675&ssl=1",900,675,true],"newspack-article-block-square-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=1200%2C675&ssl=1",1200,675,true],"newspack-article-block-landscape-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=800%2C600&ssl=1",800,600,true],"newspack-article-block-portrait-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=600%2C675&ssl=1",600,675,true],"newspack-article-block-square-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=800%2C675&ssl=1",800,675,true],"newspack-article-block-landscape-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=600%2C450&ssl=1",600,450,true],"newspack-article-block-portrait-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=450%2C600&ssl=1",450,600,true],"newspack-article-block-square-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=600%2C600&ssl=1",600,600,true],"newspack-article-block-landscape-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=400%2C300&ssl=1",400,300,true],"newspack-article-block-portrait-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=300%2C400&ssl=1",300,400,true],"newspack-article-block-square-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=400%2C400&ssl=1",400,400,true],"newspack-article-block-landscape-tiny":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/01\/Sender-Domain-Authentication.png?resize=200%2C150&ssl=1",200,150,true],"newspack-article-block-portrait-tiny":["https:\/\/i0.wp.com\/support.questetra.com\/wp-cont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NISHI","author_link":"https:\/\/support.questetra.com\/en\/author\/nishiquestetra\/"},"uagb_comment_info":1,"uagb_excerpt":"Describes how to support the Sender Domain Authentication technology, which is an effective countermeasure against spoofing emails when sending emails from Questetra.","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9DiIh-EOZ","jetpack-related-posts":[{"id":162696,"url":"https:\/\/support.questetra.com\/en\/developer-blog\/how-to-set-dkim\/","url_meta":{"origin":156921,"position":0},"title":"How to Set Up DKIM Signing for a Custom Domain","author":"Hirotaka NISHI","date":"2024-07-08","format":false,"excerpt":"DKIM is a technology to prevent spoofed emails, and uses digital signatures for emails. This section explains the setting procedure for adding a DKIM signature in a custom domain when the sender of an email sent from Questetra is changed.","rel":"","context":"In &quot;Questetra Developers Blog&quot;","block_context":{"text":"Questetra Developers Blog","link":"https:\/\/support.questetra.com\/en\/category\/developer-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/07\/dkim-config-en.png?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/07\/dkim-config-en.png?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/07\/dkim-config-en.png?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/07\/dkim-config-en.png?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/07\/dkim-config-en.png?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":160466,"url":"https:\/\/support.questetra.com\/en\/system-settings\/dkim\/","url_meta":{"origin":156921,"position":1},"title":"System Settings \u2013 DKIM","author":"Hirotaka NISHI","date":"2024-04-25","format":false,"excerpt":"The management of DKIM Private Keys","rel":"","context":"In &quot;System Settings&quot;","block_context":{"text":"System Settings","link":"https:\/\/support.questetra.com\/en\/category\/system-settings\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/04\/System-Settings-DKIM-en.png?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/04\/System-Settings-DKIM-en.png?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/04\/System-Settings-DKIM-en.png?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/04\/System-Settings-DKIM-en.png?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2024\/04\/System-Settings-DKIM-en.png?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":77209,"url":"https:\/\/support.questetra.com\/en\/developer-blog\/throwing-message-intermediate-event-email-get-started\/","url_meta":{"origin":156921,"position":2},"title":"Let&#8217;s Send an Email Automatically in the Middle of a Workflow (Basic chapter)","author":"Hirotaka NISHI","date":"2020-03-16","format":false,"excerpt":"Using \"Throwing Message Intermediate Event (Email)\", create an application that sends an mail automatically in the middle of a Workflow.","rel":"","context":"In &quot;Questetra Developers Blog&quot;","block_context":{"text":"Questetra Developers Blog","link":"https:\/\/support.questetra.com\/en\/category\/developer-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2019\/07\/featured-image-message-intermediate-event-email.png?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2019\/07\/featured-image-message-intermediate-event-email.png?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2019\/07\/featured-image-message-intermediate-event-email.png?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2019\/07\/featured-image-message-intermediate-event-email.png?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2019\/07\/featured-image-message-intermediate-event-email.png?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":76721,"url":"https:\/\/support.questetra.com\/en\/templates\/postal-matter-sending-process-20141215\/","url_meta":{"origin":156921,"position":3},"title":"Postal Mailing Process","author":"Hirotaka NISHI","date":"2022-07-20","format":false,"excerpt":"Accepts internal postal matter requests and assists for sending. 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