Cross-Mailbox Search: RFC, CLI and API Guide
Compare RFC 7377, Zimbra, Microsoft Purview, and mailbox API patterns for safe, auditable searches across authorised inboxes.
Mailbox API: A Developer's Guide to Agent-Scale Email
Build a reliable mailbox integration with scoped access, efficient retrieval, state-token sync, signed events, and retry-safe writes.
Clean Email HTML: 7 Steps to Avoid Gmail Clipping
Separate byte reduction, HTML sanitisation, email-client rendering, and inbound thread cleanup with a seven-step developer workflow.
Email Delivery Logs: Query Patterns for Developers
Trace one message, read status and provider context, then widen the query only when the evidence points to a larger issue.
Gmail OAuth Sending: Fix 5 Errors That Stop Delivery
Fix Gmail OAuth sending failures by separating consent, token, scope, payload, and quota errors across the Gmail API and SMTP XOAUTH2.
Return Path Domain Setup: 5 DNS Steps for DMARC
Configure a return path domain, verify SPF and DMARC alignment, inspect message headers, and monitor bounce handling with current Sendmux DNS records.
How to Send Email via API: A Developer Guide
Send email via API with a valid request, scoped key, uploaded attachments, idempotent retries, delivery events, and current Sendmux examples.
Email for AI Agents: Why Gmail and SendGrid Fall Short
Google Workspace can create users through an API. SendGrid can receive email. Both facts are true. Neither one settles the infrastructure decision for an agent fleet. Email for AI agents becomes an infrastructure problem when email is part of a long-running software workflow. The useful question is
SMTP Port 587 vs 2525: Which Should You Use?
Choose between SMTP ports 587 and 2525, match the correct TLS mode, and diagnose blocked connections without weakening authentication or certificate checks.
Email Rate Limiting for Safe, Predictable Sending
Queue email before sending, enforce the right counters, and handle HTTP or SMTP pressure without delaying urgent messages or creating duplicates.
