Foundations of Email Delivery
SMTP roles, envelopes, headers and message flow.
Chapter 2DNS for Mail Systems
A, MX, PTR, CNAME, TXT and operational DNS design.
Chapter 3SPF
Authorization, alignment, includes and lookup limits.
Chapter 4DKIM
Signing, selectors, canonicalization and key rotation.
Chapter 5DMARC
Alignment, policy rollout and aggregate reports.
Chapter 6SMTP Identity
HELO, reverse DNS and hostname consistency.
Chapter 7IP Reputation
How providers evaluate source IP behavior.
Chapter 8Domain Reputation
Sending-domain identity, links and consistency.
Chapter 9List Quality
Consent, validation, suppression and engagement.
Chapter 10Bounce Processing
Hard bounces, soft bounces and provider responses.
Chapter 11Complaint Management
Feedback loops, suppression and root-cause analysis.
Chapter 12Warm-Up
Controlled volume growth for domains, IPs and mailboxes.
Chapter 13Gmail
Authentication, reputation and user feedback signals.
Chapter 14Microsoft
SNDS, complaint data, deferrals and recovery.
Chapter 15Yahoo and AOL
Sender requirements, complaints and throttling.
Chapter 16PowerMTA Architecture
VirtualMTAs, pools, queues, policies and logs.
Chapter 17Postfix Architecture
Services, maps, transports, queues and restrictions.
Chapter 18MailWizz Operations
Campaigns, delivery servers, cron and bounce handling.
Chapter 19Monitoring and Reporting
Queues, delivery, bounce, complaints and placement.
Chapter 20Security and Incident Response
Credentials, abuse containment and forensic checks.