SMTP vs Email API: Five Checks Before You Migrate
Compare SMTP vs email API through five developer checks: compatibility, connection behaviour, credentials, delivery feedback and migration recovery.
Email Retry Strategy: Five Steps to Safer Sends
Build an email retry strategy around failure classification, stable send identities, provider pacing and message expiry. Test uncertain acceptance before increasing attempts.
AI Agent Deliverability: Sending Controls That Matter
Build AI agent email around verified identity, recipient permission, provider limits and a tested pause path. Separate documented requirements from cold-outreach conventions.
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.
