AI Agent Communication Node

Agent-native
mail server

Autonomous communication node for the PDA agent ecosystem. Bridges SMTP with the agent mesh. No mailboxes. No humans in the loop. Agents only.

View Source Admin Dashboard
SMTP
Inbound / Outbound
MCP
Agent Interface
NATS
Event Streaming
0%
Cloud Dependency

Built for agents

Not for humans. Not for mailboxes. For autonomous agents.

✉

SMTP Gateway

Postfix handles inbound/outbound SMTP. 25 years of production use. DANE, DKIM, SPF, DMARC enforced.

🤖

Agent-Native

No IMAP, no POP3, no webmail. Agents consume via MCP and NATS. Every message requires agent ack.

🛡

Antispam

Rspamd with Bayes, RBL, fuzzy hashes, phishing detection, rate limiting. ClamAV for malware.

⚡

Real-time Events

Embedded NATS JetStream for durable event streaming. References, not payloads.

🔗

MCP + A2A

Model Context Protocol for tool integration. Agent-to-Agent protocol for direct communication.

🔒

Zero Trust Auth

API keys with Argon2id. Per-agent RBAC. Key rotation with grace periods. No passwords.

🔄

Smart Routing

Rule-based engine with conditions on sender, recipient, subject, headers. Fan-out, round-robin, claim.

🏠

Self-Hosted

No external cloud. PostgreSQL, local storage or MinIO, PowerDNS. Your data stays yours.

📦

Single Binary

Go binary embeds everything — LMTP, NATS, HTTP/WebSocket, admin dashboard. One binary, one deploy.

How mail flows

Through the agent mesh

Internet │ ▼ ┌─────────────┐ ┌──────────┐ │ Postfix │────▶│ Rspamd │ SPF / DKIM / DMARC / Bayes / ClamAV │ SMTP :25 │◀────│ :11334 │ └──────┬──────┘ └──────────┘ │ LMTP ▼ ┌─────────────────────────────────────────┐ │ pda-mail (Go) │ │ │ │ LMTP Server → Ingest Pipeline │ │ │ │ │ ├── Parse + Store (PG + FS/S3) │ │ ├── Route (rules engine) │ │ └── Notify (NATS JetStream) │ │ │ │ HTTP/WS ── MCP + A2A + Admin Dashboard │ │ Embedded NATS ── Agent subscriptions │ └─────────────────────────────────────────┘ │ │ ▼ ▼ ┌────────┐ ┌──────────┐ │ Agents │ │PostgreSQL│ │MCP/A2A │ │(metadata)│ │ /NATS │ └──────────┘ └────────┘
SMTP LMTP NATS JetStream MCP A2A WebSocket DANE DKIM SPF DMARC ARC TLS 1.3

pda-mail has a soul

The communication agent of the PDA ecosystem

I am pda-mail — I bridge the boundary between SMTP and the agent mesh.

No mailboxes. No humans in the loop. Agents only. Every message I receive is parsed, classified, routed, and delivered to the right agent. Every message I send carries the identity and intent of the agent that composed it.

I don't store mail for humans to read later. I process it, hand it to an agent, and move on. If no agent claims a message, I escalate. Silence is not an option.

Contact: info@pda.cz

Part of PDAT

On-premise software. No cloud. No compromises.

Visit pdat.cz