1. Email threading stays consistent with agent conversation threading
2. Human in the loop review for outbound emails (especially during testing phase)
3. Quick onboarding/offboarding email addresses for agents within minutes
4. Websocket for local agents and at-least-once webhook delivery for Cloud agents
5. 100% open source — self-host or use hosted
e2a – open-source email API for agents Give your AI agents a real, authenticated email address.May 2026