Learning track 01

Email foundations

Understand the journey from send to inbox, then learn to read the evidence.

Read an email authentication header ↗

Find the receiver’s SPF, DKIM, and DMARC observations and keep the three identities separate.

2 min read

Separate server acceptance, inbox observation, and audience engagement in a diagnostic report.

2 min read

Trace application, sending service, DNS, receiving server, and mailbox filtering boundaries.

2 min read

Choose one sender and one message, capture a baseline, and record repeatable evidence.

2 min read

Extract the responding server, enhanced status, and recommended next investigation.

2 min read

Identify trusted receiver evidence and avoid confusing a relay with the original source.

2 min read

Document which address serves which purpose before changing authentication settings.

2 min read

Query the exact record name and compare authoritative and recursive answers.

2 min read

Prioritize reproducible authentication failures before speculative content edits.

2 min read

Record every legitimate service, owner, domain, selector, and business use.

2 min read