Blogs
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DMARC
Can an Email Sender Address Be Spoofed Without Any Detectable Header Errors?
SPF, DKIM, and DMARC are all passing, yet a spoofed email using your exact sender address arrived. Here is what authentication actually validates and where the gap lives.
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DMARC
How to Set Up DMARC: A Complete Beginner's Guide
A step-by-step guide for beginners who want to set up DMARC for their domain. Covers SPF and DKIM prerequisites, the correct DNS record syntax, what p=none quarantine and reject mean, and how to safely move toward enforcement.
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DMARC
Why Your Mailgun Subdomain DMARC Record Is Not Working
When you add a DMARC record to your Mailgun sending subdomain but authentication still fails, the problem is almost always alignment. Here is how to diagnose and fix it.
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DMARC
Why Your Old Campaign Domain Is a Hidden Email Security Risk
Campaign domains with no owner and no DMARC record are open receive paths for abuse. Here is what happens, what it looks like in practice, and how to find them before an attacker does.
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DMARC
Why Am I Getting Spam in Microsoft Authenticator?
Microsoft Authenticator spam arrives as push notifications, not emails. Here is what it is, why it happens, and how to make it stop.
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SPF
How to Prevent Application Email Features From Becoming Spam Relays
SaaS platforms that expose email features to users risk becoming open relays. Here is the four-layer hardening approach that prevents it.
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DMARC
Why Proofpoint Rejects Email Citing DMARC (And How to Fix It)
Proofpoint is rejecting your email citing DMARC failures even though your records look correct. Here is what is actually happening and how to fix it using DMARC reports.
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DMARC
Why Your Legitimate Email Gets Rejected by Proofpoint Citing DMARC (And How to Fix It)
Proofpoint blocks legitimate email citing DMARC failures even when SPF and DKIM pass individually. Here is exactly why that happens and how to diagnose and fix the underlying alignment problem.
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DMARC
How to Safely Move from DMARC p=none to p=reject
Step-by-step guide for sysadmins: how to read aggregate reports, fix alignment gaps, and safely switch from DMARC p=none to p=reject without breaking legitimate email.
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DMARC
How to Move to DMARC p=reject Without Breaking Legitimate Email
Most organizations want DMARC p=reject but delay the switch because they are afraid of breaking legitimate email. Here is an audit-first method that makes the migration predictable.