Cold Email Infrastructure for AI Agents
Design cold email infrastructure for AI agents with scoped sending accounts, provider-based caps, safe retries, reply handling, and suppression controls.
Outlook Sending Limits: Current Caps and Fixes
Understand current Outlook and Exchange Online sending limits, read the main NDR codes, and configure application queues around mailbox and tenant caps.
SSE vs Webhooks: Which Pattern Fits Your Job?
Compare SSE and webhooks by connection direction, recovery model, network boundary, and delivery responsibility, with a practical Sendmux implementation guide.
Email Webhooks for Reliable Inbound Mail
Build reliable email webhooks with exact signature checks, event-ID deduplication, durable acceptance, safe retries, and worker-based processing.
How to Manage an Email Suppression List
Build one reliable suppression gate for bounces, complaints, and unsubscribes across every email provider and sending path.
SPF, DKIM, and DMARC: A Practical Setup Guide
Set up SPF, DKIM, and DMARC, verify alignment, stay within the SPF lookup limit, and move safely from monitoring to enforcement.
Gmail Sending Limits: Daily Caps for Admins and Developers
Understand Gmail sending limits for personal and Workspace accounts, recipient caps, Gmail API quotas, SMTP relay, and safe scaling options.
Domain Verification Email: DNS, DKIM, and DMARC for Developers
Verify an email-sending domain with DNS TXT, DKIM, SPF, and DMARC checks, plus practical troubleshooting and safe key-rotation steps.
Your agent's mailbox is now a file store
Sendmux is the email API for AI agents. As of today, every agent mailbox also works as file storage for AI agents: files land in the mailbox by email or direct upload, and your agent lists, filters, and reads them on demand. No base64 in the prompt, no second storage service to wire up. A customer
