MailerMonk Academy.
Email authentication, sender reputation, and deliverability operations — taught the way you'd actually use them. No "ultimate guides," no fluff: each lesson is a short, focused tutorial paired with a tool you can run on your own domain.
- AuthenticationRead in 10 min
How SPF Works (and Why It Quietly Fails)
SPF explained at the protocol level: the SMTP envelope, the 10-DNS-lookup limit, alignment with DMARC, and the real failure modes that cause silent rejections.
- #spf
- #authentication
- #dns
- #deliverability
- AuthenticationRead in 11 min
How DKIM Works: Signatures, Selectors, and Key Rotation
DKIM explained at the cryptographic level: how the signature is computed, what selectors actually do, why rotation matters, and how to read a DKIM-Signature header.
- #dkim
- #authentication
- #dns
- #cryptography
- AuthenticationRead in 13 min
DMARC Explained: Alignment, Policy, and Aggregate Reports
DMARC alignment, the difference between p=none, p=quarantine, and p=reject, how to read aggregate XML reports, and how to ramp policy without losing legitimate mail.
- #dmarc
- #authentication
- #alignment
- #reporting
- AuthenticationRead in 9 min
How to Set Up BIMI: VMC Requirements and DNS
BIMI prerequisites, how to set up the DNS record, what a Verified Mark Certificate actually costs, and which mailbox providers display the logo today.
- #bimi
- #authentication
- #brand
- #vmc
- ReputationRead in 12 min
What Is Sender Reputation and How to Improve It
Sender reputation is a per-provider score driven by engagement, complaints, and authentication. Learn which signals actually move inbox placement.
- #reputation
- #deliverability
- #engagement
- #complaints
- ReputationRead in 10 min
Domain Reputation vs IP Reputation: What Matters in 2026
Mailbox providers track both your IP and From domain. Why domain reputation dominates at Gmail today, and when IP reputation still moves inbox placement.
- #reputation
- #ip
- #domain
- #gmail
- OperationsRead in 14 min
How to Warm Up an Email Domain: A 30-Day Plan
A concrete 30-day domain warm-up schedule with daily volume targets, segment selection, and the signals to watch each week. Schedules vary by ESP.
- #warm-up
- #operations
- #volume
- #deliverability
- OperationsRead in 11 min
Email List Hygiene: 5 Tasks That Move Inbox Rate
The five list hygiene best practices that actually shift inbox placement: suppression, re-engagement, role pruning, syntax/MX validation, and trap removal.
- #list-hygiene
- #operations
- #suppression
- #engagement
- OperationsRead in 11 min
Hard Bounce vs Soft Bounce: SMTP Codes Explained
Read SMTP reply codes like a deliverability engineer. What 4xx vs 5xx really mean, which codes to suppress on, and how invalid addresses erode domain reputation.
- #bounces
- #operations
- #smtp
- #suppression
- ToolsRead in 13 min
Google Postmaster Tools Guide: Every Metric Explained
How to use Google Postmaster Tools. Walk through Domain Reputation, IP Reputation, Spam Rate, Authentication, Encryption, and Delivery Errors, and what each one means.
- #postmaster-tools
- #tools
- #reputation
- ToolsRead in 11 min
Microsoft SNDS Data Explained: How to Read the Signals
Smart Network Data Services shows Outlook's view of your sending IPs. How to register, interpret RED/YELLOW/GREEN, complaint and trap data, and pair SNDS with JMRP.
- #snds
- #microsoft
- #outlook
- #tools