Moving From p=none to p=quarantine to p=reject Safely
Progressing a DMARC policy toward full enforcement is a deliberate, staged process, and jumping straight to reject without proper visibility first risks silently blocking legitimate mail.
Reading and Interpreting DMARC Aggregate (RUA) Reports
Aggregate reports are the primary technical tool for understanding exactly which sources are sending mail as your domain and whether they're passing authentication.
Reading DMARC Forensic (RUF) Reports
Forensic reports provide detailed, per-message failure data, offering more granular diagnostic detail than aggregate reports, though with important privacy and adoption caveats.
Shared IP vs. Dedicated IP: Technical Tradeoffs
Choosing between a shared and dedicated sending IP is a genuine technical tradeoff, not a simple upgrade decision, and the right choice depends on sending volume and consistency.
SPF Records Explained: Syntax and How They Work
SPF (Sender Policy Framework) publishes a list of servers authorized to send mail on behalf of a domain, letting receiving servers verify a message's origin.
The SPF 10-DNS-Lookup Limit and How to Avoid Exceeding It
SPF enforces a hard limit of 10 DNS lookups during evaluation, and exceeding it causes the entire SPF check to fail, a common and often overlooked technical trap.
Understanding Bounce Types: Hard Bounces vs. Soft Bounces
Correctly distinguishing bounce types, and handling each appropriately, is a foundational technical practice that directly protects sender reputation.
Understanding DMARC Alignment: SPF vs. DKIM Alignment Modes
DMARC alignment can be configured as strict or relaxed for both SPF and DKIM independently, and understanding the difference affects how forgiving your policy is toward legitimate but imperfectly…
Understanding Sender Score and Domain Reputation
Reputation is tracked separately by different receiving providers, and understanding how it's built and eroded is essential for diagnosing deliverability problems.
What Spam Filters Actually Look At
Spam filtering evaluates a combination of authentication, reputation, content, and engagement signals, not any single factor in isolation.
Why Email Deliverability Is Never "Set and Forget"
Deliverability infrastructure that was correctly configured at launch can degrade over time due to DNS changes, provider policy updates, or shifting sending patterns.
How Inbox Placement Differs From Delivery
Understanding the specific technical checkpoint where a message can succeed at "delivery" but fail at "inbox placement" clarifies where deliverability problems actually originate.
Understanding the Journey of an Email From Send to Inbox
Tracing the full technical path a message travels reveals the multiple checkpoints where deliverability can succeed or fail along the way.
What Email Deliverability Actually Means, Technically
Deliverability isn't just "did the email send" — it's a technical measure of whether a message actually reaches the inbox, and it depends on infrastructure decisions made long before you hit send.
What Is an MTA and How Does It Affect Deliverability
The Mail Transfer Agent is the software actually responsible for transmitting your email, and its configuration has direct, measurable effects on deliverability.
10 Ways to Get More Subscribers to Actually Open and Buy From Your Emails
Building a list is only half the battle — a large, disengaged list produces far less revenue than a smaller, genuinely engaged one. Here's what actually moves the needle on opens and conversions.
Proven List-Building Techniques That Still Work Today
Effective list building comes down to a genuinely small set of durable principles, regardless of how many "secret" techniques get marketed around them. Here's what actually, consistently works.
How to Increase Your Email Opt-In Rate
A relatively small set of changes tend to drive most of the improvement in opt-in conversion — here's where to focus first.
Should You Buy an Email List? Why Building Beats Buying
Purchasing a pre-built email list is a persistent temptation for marketers wanting to skip the slow process of organic list building — but the practice carries genuine risks that consistently…
Understanding Email Deliverability: Sending Reputation and Inbox Placement
Getting an email successfully delivered to the inbox — rather than filtered to spam or blocked entirely — depends on a genuinely technical set of factors most marketers only think about once…