Tagged “dmarc”
111 articles, page 1 of 3
The Google and Yahoo sender rules, one year on
A year after Google and Yahoo made authentication mandatory for bulk senders, here is what changed, how mail failed, and where enforcement is heading.
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How to reach DMARC p=reject without breaking email
The staged playbook to DMARC enforcement with no email outage: inventory senders, fix SPF and DKIM, ramp p=none to p=reject, and lock down subdomains.
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Troubleshooting DMARC Failure Due to Overly Restrictive SPF Records
Overly restrictive SPF records can cause DMARC failure, affecting email deliverability, learn how to troubleshoot and fix the issue
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DMARC Alignment Pitfalls with Load Balancer IP Rotation
Load balancer IP rotation can cause DMARC alignment issues, impacting email deliverability, proper management is key to maintaining alignment
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Mitigating False Positives in DMARC Reporting
False positives in DMARC reporting can lead to legitimate emails being rejected, damaging email deliverability. Optimising DMARC records is key to prevention
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DMARC Alignment Pitfalls with Multi-Tenant ESPs
DMARC alignment challenges arise with multi-tenant ESPs, causing email deliverability issues, a common problem when using shared sending infrastructure
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Optimising DMARC for Domains with High Volume Third-Party Senders
Optimise DMARC for domains with multiple third-party senders, avoiding false positives and phishing attacks
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Troubleshooting DMARC Alignment Issues with Third-Party Senders
Achieving DMARC alignment with third-party senders is crucial for email authenticity, but often proves challenging, requiring careful configuration of SPF and DKIM records
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DMARC and Email Client Configuration
DMARC prevents email spoofing, learn how to configure email clients like Mozilla Thunderbird and Microsoft Outlook for optimal security. Understand the basics of DMARC and its importance in email security
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DMARC, SPF, and DKIM for Multi-Brand Companies
Multi-brand companies can improve email deliverability with DMARC, SPF, DKIM, preventing spam and phishing, and protecting their reputation. Proper implementation is crucial for seamless communication across brands
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DMARC and Third-Party Service Onboarding: A Step-by-Step Guide to Secure Delegation
DMARC prevents email spoofing and phishing attacks by verifying email authenticity, enabling secure third-party service onboarding. This guide provides a step-by-step approach to secure delegation
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DMARC and Dynamic DNS: Authentication Challenges for Home Workers and Small Offices
DMARC is crucial for email authentication, working with SPF and DKIM to verify email authenticity, but poses challenges for home workers and small offices using Dynamic DNS. DMARC helps organisations like Barclays prevent cybercriminals from sending fake emails
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DMARC and Subdomain Delegation for Franchises and Multi-Tenant Systems
DMARC helps organisations secure email authentication, particularly for franchises and multi-tenant systems. It ensures only authorised emails are sent from their domain
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DMARC and Email Migration: A Step-by-Step Guide to Preserving Deliverability
Email migration can impact deliverability, DMARC helps prevent spoofing by verifying email authenticity
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ARC: Authenticated Received Chain explained
Forwarding and mailing lists break SPF and DKIM in transit, flipping a passing message to a DMARC failure. ARC, the Authenticated Received Chain, preserves the original authentication verdict across intermediaries with a signed, tamper-evident chain, so trusted forwarders can vouch for legitimate mail and you can reach p=reject without breaking list traffic.
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How BIMI displays in Gmail and Apple Mail
Gmail and Apple Mail both reward an enforced DMARC domain with a verified logo, but each shows it differently and both demand a certificate. Here is what each provider displays, why a Verified Mark Certificate is non-negotiable, and how to test the whole BIMI chain before you rely on it.
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How to add DMARC, SPF and DKIM records on Azure DNS
An Azure DNS-specific walkthrough of publishing TXT and CNAME records for DMARC, SPF and DKIM, covering record sets, the @ apex, TXT chunking, the CLI add-record trap, Alias records and why delegation must be set at the registrar.
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How to add DMARC, SPF and DKIM records on Cloudflare
A precise, Cloudflare-specific walkthrough of publishing TXT and CNAME records for DMARC, SPF and DKIM in the Cloudflare DNS editor, with the real gotchas: root versus host name, the orange-cloud proxy, automatic TXT chunking, CNAME flattening at the apex, TTL on Auto, and Email Routing conflicts.
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Done-for-you DMARC enforcement: how the managed path to p=reject works
Reaching p=reject is not the hard part. Anyone can change one DNS record from p=none to p=reject in thirty seconds. The hard part is reaching p=reject without silently dropping legitimate mail: the invoice from.
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Display-name spoofing and why DMARC misses it
Friendly-from spoofing impersonates a person using a domain the attacker legitimately controls, so it passes DMARC every time by design. Here is why DMARC cannot catch it, where it shows up in BEC and CEO fraud, and the layered controls that actually mitigate it.
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How to add DMARC, SPF and DKIM records on DigitalOcean
A DigitalOcean-specific walkthrough for publishing DMARC, SPF and DKIM as TXT and CNAME records in the DigitalOcean DNS editor, covering the root-vs-host hostname convention, the no-auto-chunking DKIM trap, apex CNAME rules and TTL.
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Why p=none gives a false sense of security
A DMARC record at p=none watches your domain but blocks nothing. Here is how to tell whether you are actually protected, and the safe path to enforcement.
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How to add DMARC, SPF and DKIM records on Gandi
A precise, Gandi-specific walkthrough for publishing DMARC, SPF and DKIM in the Gandi LiveDNS editor, covering the root vs host name convention, TXT quoting and chunking, CNAME trailing dots and TTL.
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How to add DMARC, SPF and DKIM records on GoDaddy
A precise, GoDaddy-specific walkthrough of adding TXT and CNAME records for DMARC, SPF and DKIM in the GoDaddy DNS editor, covering root versus host names, TXT chunking, CNAME rules and TTL.
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Turning raw DMARC XML into decisions: aggregate report analysis
A DMARC aggregate report is one of the most useful documents your domain will ever generate, and one of the least read. Publish a record with a rua= tag and, within a day or two, gzip-compressed XML files start.
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How to rotate DKIM keys safely
DKIM signing keys decay in security the longer they live. This guide shows how to rotate them using selectors, with full overlap and verification, so legitimate mail never drops a signature or fails DMARC during the change.
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How to add DMARC, SPF and DKIM records on Google Cloud DNS
A precise, Google Cloud DNS-specific walkthrough for publishing TXT and CNAME records for DMARC, SPF and DKIM, including the gotchas that silently break authentication: public versus private managed zones, console versus gcloud TXT quoting, trailing dots on CNAME targets, 255-byte chunking and a TTL strategy for a safe staged rollout to p=reject.
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Email authentication explained for beginners
Email was designed in an era when everyone on the network trusted everyone else, so it shipped with no built-in way to prove who actually sent a message.
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How to add DMARC, SPF and DKIM records on IONOS
A precise, IONOS-specific walkthrough of adding TXT and CNAME records for DMARC, SPF and DKIM in the IONOS DNS editor, covering the root-versus-host gotcha, TXT chunking, CNAME flattening, TTL and a safe sequence to p=reject.
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Why your domain can be spoofed, and how to stop it
If you own a domain and have never published a DMARC record, anyone on the internet can send email that appears to come from you.
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DMARC alignment explained, with examples
A message can pass SPF and verify DKIM yet still fail DMARC. The reason is alignment. This guide explains SPF and DKIM alignment, relaxed versus strict mode, and the exact DMARC pass rule, with five worked examples of messages that pass and fail.
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How to add DMARC, SPF and DKIM records on Namecheap
A precise, Namecheap-specific walkthrough for adding DMARC, SPF and DKIM records in the Advanced DNS editor, covering the host-field gotchas, TXT chunking, CNAME targets, TTL and the safe path from p=none to p=reject.
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The five DNS records that protect your email
Email was designed in an era of trust. The original protocol, SMTP, lets any server on the internet claim to send mail as anyone.
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Ten common DMARC mistakes and how to avoid them
The configuration and rollout mistakes that most often break mail or leave domains exposed, from jumping straight to p=reject to ignoring report drift, and exactly how to avoid each one.
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How to add DMARC, SPF and DKIM records on OVH
A precise, OVH-specific walkthrough for adding SPF, DKIM and DMARC records in the OVH DNS zone editor, covering the apex naming rule, TXT chunking for long DKIM keys, CNAME trailing dots and TTL behaviour.
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Reading your first DMARC aggregate report
A field-by-field walkthrough of a DMARC aggregate (RUA) XML report: metadata, source IPs, disposition, SPF and DKIM results, alignment, and spotting spoofers.
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Protecting parked and no-mail domains
Domains that never send mail are the easiest to secure and the most commonly left wide open. Here is how to lock down parked, legacy and campaign domains with SPF -all, DMARC p=reject and a null MX so they cannot be spoofed, with zero deliverability risk.
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How to add DMARC, SPF and DKIM records on AWS Route 53
A precise, Route 53-specific walkthrough for publishing SPF, DKIM and DMARC: empty Record name versus host names, TXT quoting and 255-character chunking, why DKIM CNAMEs must never become Alias records, and TTL strategy for a safe staged path to p=reject.
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Mailing lists, DMARC and ARC
Mailing lists are one of the few places where correct, well-behaved email authentication still breaks for reasons that are nobody's fault.
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DMARC for Google Workspace
A new Google Workspace domain ships with no DKIM signing, an SPF record you must add yourself, and no DMARC policy at all. This guide walks the exact order to fix that: get SPF right under the 10-lookup limit, switch on DKIM in the Admin console, then ratchet DMARC from monitoring to full reject without breaking a single legitimate message.
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How to add DMARC, SPF and DKIM records on Squarespace
A precise, Squarespace-specific walkthrough of adding TXT and CNAME records for DMARC, SPF and DKIM in the Squarespace DNS editor, including the gotchas that actually break setups: the doubled-domain Host field, TXT chunking, CNAME-at-apex, SPF flattening and TTL.
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Aliases, .forward files and DMARC
An alias looks like the most innocent thing in email. You point sales@yourcompany.com at three colleagues, you set up info@ to land in a shared mailbox, a member of staff configures their university address to drop.
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DMARC for Microsoft 365
A practical, ordered guide to email authentication on Microsoft 365: build a complete SPF record for Exchange Online, enable DKIM signing with Microsoft's two selector CNAMEs, and walk DMARC safely from p=none through quarantine to p=reject without breaking your mail.
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How to add DMARC, SPF and DKIM records on Wix
A precise, Wix-specific walkthrough of adding TXT and CNAME records for DMARC, SPF and DKIM in the Wix DNS editor, covering the real gotchas: relative host names, long-TXT chunking, CNAME targets without a trailing dot, the one-SPF-record rule and TTL during testing.
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Amazon SES at scale: deliverability and DMARC
Amazon SES is deceptively easy to start with and deceptively hard to run well at volume. Verifying a domain, adding three DNS records and firing your first message takes an afternoon.
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The DMARC pct tag and sampling, explained
The DMARC pct tag samples how often your policy is applied to failing mail, pushing the remainder down one level. Here is why pct=0 is a downgrade trap, how receivers actually apply the sample, and how to ramp pct safely from p=none to a full p=reject.
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p=none vs quarantine vs reject
The three DMARC policies compared: what p=none, p=quarantine and p=reject each tell receivers to do with failing mail, and how to progress between them safely without breaking your own email.
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The DMARC record explained, tag by tag
A plain-English reference to every tag in a DMARC record: v, p, sp, rua, ruf, pct, adkim, aspf, fo, rf and ri. What each one does, the exact syntax it expects and the sensible default to reach for.
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