Email security, authentication, deliverability, and routing — from a portfolio of specialized email products trusted by over 50,000 organizations since 2014.https://duocircle.com/en-ushttps://duocircle.com/blog/bimi-2026-what-the-ca-does-what-your-dmarc-tool-does/https://duocircle.com/blog/bimi-2026-what-the-ca-does-what-your-dmarc-tool-does/BIMI confuses buyers because two different vendors handle two different jobs. Here is the clean split between VMC procurement (a Certificate Authority function) and BIMI hosting (what your DMARC reporting tool actually does).Tue, 05 May 2026 18:30:00 GMTBIMIDMARCVMCemail authenticationbrandbrad-slavinhttps://duocircle.com/blog/when-spf-lookup-limits-actually-break-things/https://duocircle.com/blog/when-spf-lookup-limits-actually-break-things/The SPF 10-DNS-lookup limit silently breaks email authentication once you exceed it. Here is how to diagnose a permerror, why even careful organizations end up over the limit, and the fix options that actually work.Tue, 05 May 2026 18:00:00 GMTspfDMARCemail authenticationpermerrorspf flatteningemail deliverabilitybrad-slavinhttps://duocircle.com/blog/office-copiers-cant-authenticate-to-microsoft-365-the-fix/https://duocircle.com/blog/office-copiers-cant-authenticate-to-microsoft-365-the-fix/Your scan-to-email died after a Microsoft 365 update. Here's why basic auth and SMTP AUTH got disabled, the three options your IT team actually has, and the fastest reliable fix.Tue, 05 May 2026 17:30:00 GMTsmtpoutbound smtpOffice 365email migrationscan to emailMicrosoft 365brad-slavinhttps://duocircle.com/blog/dmarc-p-none-is-a-setup-not-a-deployment/https://duocircle.com/blog/dmarc-p-none-is-a-setup-not-a-deployment/Publishing a DMARC record at p=none is the starting line, not the finish line. Here is what p=none actually does, what it does not, and how to move to enforcement without breaking legitimate mail.Tue, 05 May 2026 17:00:00 GMTDMARCemail securityspfdkimbrad-slavinhttps://duocircle.com/blog/cyber-security-news-update-week-18-of-2026/https://duocircle.com/blog/cyber-security-news-update-week-18-of-2026/Here’s your weekly roundup of the most significant cybersecurity stories from the past week, covering major data breaches, critical vulnerabilities.Mon, 04 May 2026 18:54:08 GMTcyber securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/poor-email-testing-silently-costing-saas-companies-thousands/https://duocircle.com/blog/poor-email-testing-silently-costing-saas-companies-thousands/Email is one of the most critical communication channels for SaaS companies.Mon, 04 May 2026 18:43:26 GMTemail headeremail marketingemail securitybrad-slavinhttps://duocircle.com/blog/shadow-ai-email-security-risks-from-unauthorized-employee-ai-tools/https://duocircle.com/blog/shadow-ai-email-security-risks-from-unauthorized-employee-ai-tools/A data-driven analysis with 20+ statistics from Verizon, IBM, Cisco, KPMG, LayerX, Microsoft, the World Economic Forum, and others.Mon, 04 May 2026 17:14:44 GMTDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/how-spf-record-all-affects-email-routing-hybrid-cloud-environments/https://duocircle.com/blog/how-spf-record-all-affects-email-routing-hybrid-cloud-environments/In today’s digital landscape, especially within hybrid cloud frameworks, email authentication has become increasingly vital.Thu, 30 Apr 2026 19:33:51 GMTDKIMDMARCspfSPF recordbrad-slavinhttps://duocircle.com/blog/why-diy-ing-dmarc-could-cost-more-than-you-think/https://duocircle.com/blog/why-diy-ing-dmarc-could-cost-more-than-you-think/Why DIY-ing DMARC could cost you more than you think.Thu, 30 Apr 2026 18:07:32 GMTDKIMDMARCemail securityNewsSecurityspfbrad-slavinhttps://duocircle.com/blog/7-critical-factors-before-you-buy-smtp-relay-services/https://duocircle.com/blog/7-critical-factors-before-you-buy-smtp-relay-services/Email remains an essential communication tool for businesses, utilized for everything from transactional notifications to marketing initiatives and customer.Wed, 29 Apr 2026 19:34:01 GMTDKIMDMARCemail securityspfbrad-slavinhttps://duocircle.com/blog/dmarc-spf-dkim-2026-email-authentication-regulatory-requirement-best-practice/https://duocircle.com/blog/dmarc-spf-dkim-2026-email-authentication-regulatory-requirement-best-practice/A data-driven analysis with 20+ statistics from EasyDMARC, Google, Microsoft, IBM, Verizon, CISA, and the PCI Security Standards Council.Wed, 29 Apr 2026 15:03:08 GMTcyber securityDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/designing-custom-dkim-architecture-for-high-volume-email-senders/https://duocircle.com/blog/designing-custom-dkim-architecture-for-high-volume-email-senders/Organizations that send large volumes of emails, including software-as-a-service (SaaS) platforms, marketing automation providers.Tue, 28 Apr 2026 19:36:39 GMTDKIMDMARCemail securitybrad-slavinhttps://duocircle.com/blog/ai-generated-phishing-eliminates-typos-making-traditional-email-filters-ineffective/https://duocircle.com/blog/ai-generated-phishing-eliminates-typos-making-traditional-email-filters-ineffective/A data-driven analysis for security leaders, IT teams, and MSPs — with 20+ primary-source statistics from Microsoft, IBM, FBI IC3, KnowBe4, Verizon, Cisco.Tue, 28 Apr 2026 15:45:31 GMTcyber securityDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/cyber-security-news-update-week-17-of-2026/https://duocircle.com/blog/cyber-security-news-update-week-17-of-2026/Sri Lanka Cyberattack, SilentGlass Threat Defense, Rituals Data Breach – Cybersecurity News [April 20.Mon, 27 Apr 2026 17:20:04 GMTcyber securityDKIMDMARCemail securityNewsSecurityspfUpdatesbrad-slavinhttps://duocircle.com/blog/how-migrate-windows-smtp-server-to-cloud-smtp-without-downtime/https://duocircle.com/blog/how-migrate-windows-smtp-server-to-cloud-smtp-without-downtime/Transitioning from a Windows-based SMTP server to a cloud-hosted solution has evolved beyond simple modernization; it’s now a key strategic initiative aimed at.Fri, 24 Apr 2026 19:35:44 GMTDKIMDMARCemail securitybrad-slavinhttps://duocircle.com/blog/trust-by-design-rethinking-dkim-settings-for-modern-email/https://duocircle.com/blog/trust-by-design-rethinking-dkim-settings-for-modern-email/Email trust is no longer a background technical detail—it’s the foundation of how brands communicate, protect users.Thu, 23 Apr 2026 20:23:52 GMTDKIMDMARCemail securityspfbrad-slavinhttps://duocircle.com/blog/5-best-dkim-record-examples-selectors-key-lengths-txt-formatting/https://duocircle.com/blog/5-best-dkim-record-examples-selectors-key-lengths-txt-formatting/Why these DKIM record examples matter A well-formed DKIM record is the foundation of email authentication.Tue, 21 Apr 2026 20:00:03 GMTbrad-slavinhttps://duocircle.com/blog/cyber-security-news-update-week-16-of-2026/https://duocircle.com/blog/cyber-security-news-update-week-16-of-2026/UK Cyber Surge, Poland Incident Surge, Japan Shipping Attack – Cybersecurity News [April 13.Mon, 20 Apr 2026 16:51:57 GMTcyber securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/email-security/enterprise-email-security-heres-what-you-should-know-about-it/https://duocircle.com/blog/email-security/enterprise-email-security-heres-what-you-should-know-about-it/When your organization operates at scale, emails don’t go out from one domain; they are sent from marketing platforms, HR systems, finance tools.Thu, 16 Apr 2026 18:28:51 GMTDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/email-security/behind-the-signature-a-curious-journey-into-dkim-implementation/https://duocircle.com/blog/email-security/behind-the-signature-a-curious-journey-into-dkim-implementation/Every verified email has an unseen signature that plays a crucial role in establishing trust.Thu, 16 Apr 2026 18:23:57 GMTDKIMDMARCemail securityspfbrad-slavinhttps://duocircle.com/blog/email-security/9-reliable-providers-for-a-managed-outgoing-smtp-email-server-solution/https://duocircle.com/blog/email-security/9-reliable-providers-for-a-managed-outgoing-smtp-email-server-solution/In the fast-moving digital world of today, effective email delivery is essential for businesses that rely on smooth communication and customer interactions.Wed, 15 Apr 2026 20:18:02 GMTDMARCemail securityspfbrad-slavinhttps://duocircle.com/blog/email-security/the-signature-checkpoint-dkim-testing-at-the-gates-of-the-inbox/https://duocircle.com/blog/email-security/the-signature-checkpoint-dkim-testing-at-the-gates-of-the-inbox/As email security continues to advance, the inbox serves as a crucial entry point, with DKIM testing playing an essential role in its protection.Tue, 14 Apr 2026 18:07:40 GMTDKIMemail securitybrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-15-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-15-of-2026/Apple Pay Scam, Crypto Fraud Victims, Retirement Phishing Loss – Cybersecurity News [April 06.Mon, 13 Apr 2026 16:49:48 GMTDKIMDMARCemail securityNewsSecurityspfUpdatesbrad-slavinhttps://duocircle.com/blog/dmarc/how-arc-resolves-email-authentication-for-forwarded-messages/https://duocircle.com/blog/dmarc/how-arc-resolves-email-authentication-for-forwarded-messages/How ARC resolves email authentication for forwarded messages.Thu, 09 Apr 2026 17:12:29 GMTDKIMDMARCspfSPF recordbrad-slavinhttps://duocircle.com/blog/email-security/avoiding-burn-how-an-spf-generator-for-godaddy-can-still-toast-your-dmarc-if-misused/https://duocircle.com/blog/email-security/avoiding-burn-how-an-spf-generator-for-godaddy-can-still-toast-your-dmarc-if-misused/The Sender Policy Framework is deceptively simple: publish a single SPF record as a TXT record in your domain DNS so receiving systems can check whether a.Thu, 09 Apr 2026 12:57:15 GMTbrad-slavinhttps://duocircle.com/blog/email-security/12-best-hosted-smtp-servers-for-high-deliverability-in-2026/https://duocircle.com/blog/email-security/12-best-hosted-smtp-servers-for-high-deliverability-in-2026/Selecting the appropriate hosted SMTP server in 2026 is crucial for getting your emails delivered to the inbox rather than the spam folder.Wed, 08 Apr 2026 18:18:54 GMTDKIMDMARCemail securitySecuritybrad-slavinhttps://duocircle.com/blog/email-hosting/inbox-wars-winning-with-powerful-smtp-email-hosting/https://duocircle.com/blog/email-hosting/inbox-wars-winning-with-powerful-smtp-email-hosting/In the bustling digital environment of today, the quest for consumer attention often starts with the inbox.Tue, 07 Apr 2026 17:56:44 GMTDKIMDMARCemail securitySPF recordbrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-14-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-14-of-2026/LinkedIn Fraud Spike, SIM Scam Bust, UK VIPs Targeted – Cybersecurity News [March 30.Mon, 06 Apr 2026 15:35:48 GMTcyber securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/email-services/8-genius-tricks-to-master-your-dkim-validator-like-a-pro/https://duocircle.com/blog/email-services/8-genius-tricks-to-master-your-dkim-validator-like-a-pro/Navigating email authentication can often feel overwhelming, particularly when it comes to DKIM validation and ensuring your emails reach their intended.Thu, 02 Apr 2026 20:59:18 GMTbrad-slavinhttps://duocircle.com/blog/email-security/what-happens-when-dkim-key-compromised-and-how-to-fix/https://duocircle.com/blog/email-security/what-happens-when-dkim-key-compromised-and-how-to-fix/What happens when your DKIM key is compromised? How can you identify and fix the problem?Thu, 02 Apr 2026 18:40:39 GMTDKIMDMARCSecurityspfbrad-slavinhttps://duocircle.com/blog/phishing-protection/how-domain-verification-helps-prevent-email-phishing-attacks/https://duocircle.com/blog/phishing-protection/how-domain-verification-helps-prevent-email-phishing-attacks/Email is still the most exploited initial vector of attacks in cybersecurity.Wed, 01 Apr 2026 16:48:42 GMTcyber securityDKIMDMARCemail securitySecurityspfSPF recordbrad-slavinhttps://duocircle.com/blog/email-services/set-up-a-dkim-key-for-microsoft-365-custom-domains-a-step-by-step-guide/https://duocircle.com/blog/email-services/set-up-a-dkim-key-for-microsoft-365-custom-domains-a-step-by-step-guide/This step-by-step guide explains how to prepare your Microsoft 365 tenant and custom domain to publish a DKIM record.Tue, 31 Mar 2026 19:14:02 GMTbrad-slavinhttps://duocircle.com/blog/email-security/how-the-best-anti-phishing-software-prevents-email-based-attacks/https://duocircle.com/blog/email-security/how-the-best-anti-phishing-software-prevents-email-based-attacks/Email-centric threats continue to be a prevalent and expensive cybersecurity challenge for both companies and individuals.Mon, 30 Mar 2026 18:19:45 GMTbrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-13-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-13-of-2026/AI Phishing Campaign, TikTok Phishing Targeted, Dutch Police Cyberattack – Cybersecurity News [March 23.Mon, 30 Mar 2026 17:48:10 GMTcyber securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/dmarc/why-is-dmarc-important-for-the-retail-sector/https://duocircle.com/blog/dmarc/why-is-dmarc-important-for-the-retail-sector/Why is DMARC important for the retail sector?Fri, 27 Mar 2026 17:39:27 GMTDMARCemail securitySecuritybrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-12-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-12-of-2026/Horabot Resurfaces Mexico, Aura Breach Compromise, Tax Season Threats – Cybersecurity News [March 16.Mon, 23 Mar 2026 15:24:16 GMTcyber securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/email-security/vmc-vs-cmc-explained-which-logo-certificate-should-you-choose/https://duocircle.com/blog/email-security/vmc-vs-cmc-explained-which-logo-certificate-should-you-choose/VMC vs CMC explained: Which logo certificate should you choose?Thu, 19 Mar 2026 15:51:40 GMTDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-11-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-11-of-2026/Cambodia Targets Cybercriminals, Traditional Security Insufficient, AI Against Phishing – Cybersecurity News [March 09.Mon, 16 Mar 2026 16:30:08 GMTcyber securityemail securityNewsSecurityUpdatesbrad-slavinhttps://duocircle.com/blog/email-security/8-best-tools-to-test-dkim-records-and-fix-signature-errors/https://duocircle.com/blog/email-security/8-best-tools-to-test-dkim-records-and-fix-signature-errors/Email authentication is vital for safeguarding your domain against spoofing and enhancing email deliverability.Thu, 12 Mar 2026 15:00:40 GMTbrad-slavinhttps://duocircle.com/blog/email-services/troubleshoot-failed-signatures-using-dns-dkim-lookup-and-record-inspector/https://duocircle.com/blog/email-services/troubleshoot-failed-signatures-using-dns-dkim-lookup-and-record-inspector/Email authentication plays a critical role in protecting your domain from spoofing and ensuring that your messages reach recipients’ inboxes.Wed, 11 Mar 2026 16:15:38 GMTbrad-slavinhttps://duocircle.com/blog/email-hosting/10-steps-set-up-self-hosted-mail-server-avoid-spam/https://duocircle.com/blog/email-hosting/10-steps-set-up-self-hosted-mail-server-avoid-spam/Self-hosted email gives you control, privacy, and the flexibility to run open source software instead of relying entirely on a mail service provider.Tue, 10 Mar 2026 15:33:04 GMTbrad-slavinhttps://duocircle.com/blog/cybersecurity/ncsc-mail-check-web-check-retirement-what-it-means/https://duocircle.com/blog/cybersecurity/ncsc-mail-check-web-check-retirement-what-it-means/NCSC announces the retirement of Mail Check and Web Check: Here’s what it really means.Tue, 10 Mar 2026 13:47:56 GMTDMARCSecuritybrad-slavinhttps://duocircle.com/blog/announcements/cyber-security-news-update-week-10-of-2026/https://duocircle.com/blog/announcements/cyber-security-news-update-week-10-of-2026/LastPass Users Phished, Amazon Down US, UK Cybersecurity Boost – Cybersecurity News [March 02.Mon, 09 Mar 2026 14:20:08 GMTcyber securityDKIMDMARCNewsSecurityspfUpdatesbrad-slavinhttps://duocircle.com/blog/dmarc/what-is-dmarc-quarantine-understanding-the-pquarantine-policy-in-2026/https://duocircle.com/blog/dmarc/what-is-dmarc-quarantine-understanding-the-pquarantine-policy-in-2026/Email authentication has moved far beyond a technical checkbox. In 2026, mailbox providers expect domains to actively enforce authentication policies to pr.Fri, 06 Mar 2026 17:11:33 GMTDKIMDMARCspfSPF recordbrad-slavinhttps://duocircle.com/blog/email-security/mail-relay-server-security-preventing-spam-and-unauthorized-access/https://duocircle.com/blog/email-security/mail-relay-server-security-preventing-spam-and-unauthorized-access/What mail relay servers are, why they’re targeted, and the risks of misconfiguration A mail relay server is the SMTP-facing component that accepts, routes.Fri, 06 Mar 2026 15:36:44 GMTbrad-slavinhttps://duocircle.com/blog/data-privacy/cutting-block-rates-measurable-scraping-habits-data-proxies-proof-strategies/https://duocircle.com/blog/data-privacy/cutting-block-rates-measurable-scraping-habits-data-proxies-proof-strategies/Most scraping failures are predictable once you measure the right things.Thu, 05 Mar 2026 19:15:52 GMTDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/dmarc/8-warning-signs-your-domain-needs-a-dmarc-test-now/https://duocircle.com/blog/dmarc/8-warning-signs-your-domain-needs-a-dmarc-test-now/Improperly authenticated emails can leave your domain susceptible to issues such as spoofing, phishing, and undelivered messages, often without your awareness.Thu, 05 Mar 2026 18:24:20 GMTbrad-slavinhttps://duocircle.com/blog/email-security/smtp-security-operational-layers-behind-reliable-email-delivery/https://duocircle.com/blog/email-security/smtp-security-operational-layers-behind-reliable-email-delivery/Understanding the Email Delivery Ecosystem Email remains an essential communication channel for businesses worldwide, playing a critical role in marketing.Tue, 03 Mar 2026 18:36:33 GMTDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/data-privacy/replacing-legacy-cms-platforms-when-webflow-makes-business-sense/https://duocircle.com/blog/data-privacy/replacing-legacy-cms-platforms-when-webflow-makes-business-sense/Your website is the place prospects decide whether you feel credible, customers decide whether you feel current.Tue, 03 Mar 2026 18:13:59 GMTDKIMDMARCemail securitySecurityspfbrad-slavinhttps://duocircle.com/blog/email-security/adding-a-dkim-record-in-dns-for-better-email-security/https://duocircle.com/blog/email-security/adding-a-dkim-record-in-dns-for-better-email-security/Email security threats continue to evolve, making strong authentication more important than ever.Tue, 03 Mar 2026 15:50:12 GMTbrad-slavin