Blogs
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SPF
SPF include vs redirect — the Practical Difference
Both include and redirect delegate your SPF record to another domain. They sound similar. They behave very differently.
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Deliverability
What Percentage of Mail Servers Refuse Email Without TLS? A Data-Driven Look
Most major email providers enforce TLS encryption, but the wider internet is patchier. Here is what the data shows and what it means for your mail server configuration.
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Deliverability
What Actually Breaks When Your Domain Expires (And How to Prevent It)
When a domain expires, email stops working in ways most administrators never anticipate. This guide covers exactly what breaks, why, and how to prevent it before it happens to you.
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Deliverability
How to Stop Backscatter NDR Emails from Your Server
Backscatter NDRs are bounced spam notifications your server sends to innocent people. Here is exactly why they happen and how to configure your mail server to stop generating them.
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DMARC
When SPF and DKIM Pass But DMARC Fails: What It Means and What to Do
SPF and DKIM passing but DMARC failing means the email authenticated but failed alignment checks. Here is what that actually means for trust.
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DMARC
Why SPF and DKIM Pass But DMARC Alignment Still Fails
When SPF and DKIM both pass but DMARC fails, the issue is not authentication but alignment. DMARC checks that the From domain matches the domain that passed SPF or DKIM. Here is why that matters and how to fix it.
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DMARC
Why Your DMARC Aggregate Reports Are Not Arriving (and How to Fix It)
Setting up DMARC reporting but getting no reports? This guide walks through every common reason RUA aggregate reports stop arriving and how to fix each one.
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DMARC
How to Protect High-Risk Executive Inboxes Without Breaking the Bank
Small teams can protect executive email accounts from impersonation and compromise without enterprise budgets. Here is what actually reduces risk, ranked by impact.
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DMARC
How to Check SPF, DKIM, and DMARC Records for Any Domain
A practical guide to checking SPF, DKIM, and DMARC records using dig, nslookup, and free online tools like MXToolbox.
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DMARC
Why DMARC Fails on Forwarded Email and How to Fix It
Forwarded emails often fail DMARC because forwarding rewrites the From header, breaking SPF and DKIM alignment. Here is why it happens and what to do about it.