AgentMail gives agents an inbox. Truncus gives agents execution certainty. Different layers. Complementary infrastructure.
Your Agent
AgentMail
Create inbox, manage threads, receive replies
Truncus
Execute sends, guarantee delivery, handle failures
SES
Postmark
Mailgun
Different strengths for different layers. Where we don't compete, we say so.
| Capability | Truncus | AgentMail |
|---|---|---|
| Category | Execution layer | Inbox system |
| Core job | Guarantee delivery outcomes | Manage email conversations |
| Synchronous delivery confirmation | Yes (send_sync, ~1s) | No |
| Operations API (durable sends) | Yes | No |
| Delivery guarantees | best_effort / at_least_once / exactly_once | No |
| Multi-provider failover | SES + Postmark + Mailgun + SendGrid | Unknown |
| Global message identity | Yes (across retries/providers) | No |
| Content-based deduplication | Yes | No |
| Pre-send validation + confidence scoring | Yes | No |
| Post-send intelligence | Failure explanations + actions | No |
| Account reputation engine | Auto-throttle/suspend | Unknown |
| Kill switch | Yes | No |
| Governance (monitor/enforce/block) | Yes | No |
| Sandbox + event replay | Yes | No |
| Programmatic inbox creation | No | Yes |
| Two-way conversations | Inbound webhooks | Yes (native) |
| Thread management | No | Yes |
| Agent identity layer | No | Yes |
| MCP server | 197 tools | Yes |
| CLI | @vanmoose/truncus-cli | No |
| EU data residency | Default | No |
| Pricing | Free (3K), $19 Pro, $99 Scale | Free (3 inboxes), $20 Dev, $100 Startup |
Comparison based on publicly available information as of March 2026. AgentMail is a trademark of AgentMail Inc.
Your agent needs an inbox:
Your agent needs execution certainty:
Reliable delivery for conversations:
“AgentMail decides what to say. Truncus makes sure it arrives.”
Truncus and AgentMail are complementary infrastructure. We build the execution layer. They build the inbox layer. Together, agents get reliable, governed email communication.
Try Truncus free — 3,000 emails/month