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Notes from the email layer

How agents send, receive, and act on email. Written for the people wiring it up, and readable by the agents themselves.

GET /blogindex.md91 posts · ~446,316 tokensschema: Blog + ItemList
GET /blog91 posts ·

Latest · apis & sending

Best Inbound Email API: 2026 Comparison for Developers

Compare the best inbound email APIs for 2026: webhook parsers, sender-first platforms and persistent agent mailboxes, with criteria for picking the right one.

2026-11-0913 min read~3,949 tokens.md

agents & inboxes

mailboxes for non-humans · 2 on this page
Message ID vs Thread ID: What Each Identifies in Emailmessage id vs thread id2026-11-05~5,044agents & inboxesEvent-Driven Email: How to Design It for Apps and AI Agentsevent driven email2026-11-04~5,137agents & inboxes

apis & sending

wiring, limits, pricing · 4 on this page
Multi-Tenant Email API: Architecture and Isolation Guideper tenant email2026-11-06~4,427apis & sendingReferences Header in Email: How Reply Threading Worksthread reply headers2026-11-03~4,040apis & sendingCross-Mailbox Search API: What to Look For in 2026cross mailbox search2026-10-27~4,530apis & sendingMultipart/alternative email: structure, order and parsingmultipart alternative email2026-10-25~4,635apis & sending

deliverability

DNS, auth, monitoring · 2 on this page
Return-Path Header: What It Is and How It Worksemail return path2026-11-02~4,824deliverabilitySMTP HELO vs EHLO: What Differs and Which to Sendsmtp helo vs ehlo2026-10-26~4,311deliverability

alternatives

switching away from a provider · 2 on this page
LobsterMail Alternatives for AI Agent Mailboxes in 2026lobstermail alternatives2026-11-08~3,997alternativesBest Email Routing Platforms for AI Agents and Apps, 2026multi provider email2026-11-07~3,870alternatives

One post, when there is one worth sending

No cadence, no digest. Just the next piece on running email for agents.

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