Email Protocols

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Moving a message into another person's inbox: SMTP transfer, IMAP and POP3 retrieval, SPF, DKIM and DMARC sender checks, and S/MIME signing. Interviewers test protocol reasoning on a federated system.

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SMTPempty
- Command/Reply Sequenceempty
- Envelope vs From Headerempty
- Relaying and MX Routingempty
- STARTTLS, MTA-STS & DANEempty
- Submission Auth & Bouncesempty
IMAPempty
- Session and Mailbox Modelempty
- Message Flags and Stateempty
- Fetch and Partial Fetchempty
- Server-Side Searchempty
- IDLE and Multi-Device Syncempty
POP3empty
SPFempty
- TXT Record Syntaxempty
- Mechanisms & Qualifiersempty
- 10-Lookup Limitempty
- Results & Forwarding Breakageempty
DKIMempty
- Message Signingempty
- Selectors & Key Recordsempty
- Canonicalization & Body Lengthempty
- Signature Verificationempty
- Key Rotationempty
DMARCempty
- Identifier Alignmentempty
- Policy Record Tagsempty
- Policies & Subdomainsempty
- Aggregate & Failure Reportsempty
- Rollout & Operationsempty
S/MIMEempty
- CMS SignedDataempty
- CMS EnvelopedDataempty
- Mailbox Certificate Profileempty
- Certificate Discovery and Trustempty
- Private Key Custodyempty
- OpenPGP Comparisonempty