Email Blacklist Check: What Lookup Tools Don't Tell You
A blacklist lookup is a DNS query with three outcomes, and most tools hide one. Here is how to run it, script it, and read bounce codes correctly.
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Email Bounce Rate: How to Measure It and What to Fix
Email bounce rate is bounces divided by sends, but the denominator, bounce type and stream change the answer. Here is how to measure it and what to alert on.
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Onboarding Email Sequence: Build It on Events, Not Days
A practical blueprint for an onboarding email sequence driven by user events: the five emails, the trigger logic, exit conditions and how to measure it.
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What Is an SPF Record? Syntax, Limits and Failure Modes
An SPF record lists the servers allowed to send mail for your domain. Here is the syntax, the 10-lookup limit, forwarding failures and how to check yours.
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Welcome Email Examples: 5 Flows With Timing and Triggers
Five welcome email examples with the trigger, delay and cancel condition behind each, plus the sending infrastructure that decides whether new users ever see them.
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Abandoned Cart Email Examples: 5 Flows With Triggers
Five abandoned cart email examples with subject lines, trigger rules and timing, plus the event schema and suppression logic that decide whether they earn revenue.
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What Is DMARC? Alignment, Policies and the 2026 RFCs
DMARC tells receivers what to do when mail fails alignment. Here is how the record, policies and reports work, and what changed in 2026.
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Soft Bounce vs Hard Bounce Email: Infrastructure Guide
Understanding soft bounce vs hard bounce in email is foundational for any team running email at scale. SMTP codes 4xx and 5xx determine whether to retry or suppress.
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Transactional vs Marketing Email: The Infrastructure Split
Transactional and marketing email look the same at the wire level. The infrastructure requirements diverge once you measure latency, complaint rates, and legal obligations.
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What Is DKIM? Email Authentication Standard Explained
DKIM adds an RSA cryptographic signature to every outbound email. The receiving MTA verifies it against your DNS-published public key before deciding where the message lands.
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Why Your Emails Go to Spam: A Deliverability Diagnostic
Emails land in spam because of broken authentication, damaged IP reputation, content triggers, or list hygiene failures. This diagnostic covers each cause in order.
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What Is AI Marketing Automation? An Infrastructure Take
AI marketing automation reads behavioral signals to trigger lifecycle email flows at the moment of intent. What engineering teams need to know about the stack.
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AI Marketing Case Studies: What the Traces Actually Show
Real metrics from AI marketing case studies: send-time optimization, signal-driven segmentation, and subject line generation examined.
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AI Marketing Skills That Actually Survive Production
The AI marketing skills worth building go beyond prompt syntax. Signal quality, trigger architecture, and Bayesian testing rigor determine whether AI personalization survives in production.
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What Is GEO and What It Does to Your Activation Pipeline
GEO is the practice of getting your SaaS cited in AI-generated answers. It changes the behavioral profile of inbound traffic and every timing assumption in your activation lifecycle sequences.
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What an AI Coding Agent Should Never Touch in Production
Real incidents, a blast-radius comparison of Devin, Replit Agent, and Cursor, and the scoped-access rules we use before an AI coding agent touches production.
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AI Agent vs Chatbot: What Changes in Your Email Stack
The AI agent vs chatbot debate gets reduced to marketing. For an email stack, the real line is whether the system can write back to your ESP, or only suggest what to send.
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AI Agent Examples: From Reflex Agents to Multi-Agent
AI agent examples spanning email lifecycle triggers, fraud detection, and customer support: what teams have deployed at scale, what broke, and which patterns survived contact with real systems.
