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Blog
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DKIM
Why Exchange 2016 DKIM Signing Stops Working After an Update (And How to Fix It)
<p>Exchange Server DKIM signing commonly breaks after Windows or Exchange Cumulative Updates. Here's what causes it, how to diagnose it, and how to restore signing - plus how to catch it faster next time.</p>
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DMARC
How to Forward DMARC Reports to a Third-Party Aggregator Using Amazon SES Rules
Amazon SES can forward DMARC reports to any email address or S3 bucket. Here's how to route them to a third-party DMARC aggregator — and what commonly breaks.
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DMARC
Why Your DMARC Report Parser Keeps Breaking (And How to Fix It)
Most DMARC aggregate reports are not RFC compliant, causing standard parsers to break. Here's why and what you can do about it.
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SPF
What to Do When You Inherit a Domain with a Bloated SPF Record and No DKIM Keys
You took over a domain and found an SPF record with 14 includes and DKIM selectors nobody remembers. Here is how to clean it up without breaking mail.
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SPF
What Causes an SPF Record to Suddenly Fail on a Previously Working Domain
Your SPF record has not changed, but your emails are suddenly failing. Here is what can cause SPF to break even when your DNS has not.
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DMARC
Why Phishing Arrives Even When SPF, DKIM, and DMARC All Pass
SPF, DKIM, and DMARC all passing does not mean an email is safe. Here's what those checks actually prove — and what they don't.
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DMARC
Why DMARC p=none Does not Protect Your Domain (And What Actually Does)
Only 37% of DMARC-protected domains use strict enforcement. Learn why p=none does not protect your domain, and how to safely move to p=reject without breaking your mail.
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SPF
SPF include vs redirect - What's the Practical Difference?
The difference between SPF include: and redirect= mechanisms, when to use each, and what breaks when you pick the wrong one.
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DMARC
How to Read and Interpret Your Cloudflare DMARC Reports
A plain-English guide to every field in a Cloudflare DMARC report — what passes, what fails, and why your mail might be rejected.
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SPF
Google Workspace SPF and DKIM Both Failing After Setup: What to Check
<p>SPF and DKIM both failing in your Google Workspace DMARC report? Check the Source IP first, in most cases it is forwarding, not a broken setup.</p>