v5.1.3

changelog.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## 2026-02-11 - 5.1.3 - fix(docs)
+clarify sendEmail default behavior and document automatic MX discovery and delivery modes
+
+- Updated README to describe automatic MX record discovery and grouping behavior when using sendEmail() (MTA mode)
+- Added a Delivery Modes section and API signature for sendEmail(mode) describing mta, forward, and process options
+- Expanded examples to show multi-recipient delivery, explicit mode usage, and retained low-level sendOutboundEmail example
+
+## 2026-02-11 - 5.1.2 - fix(readme)
+adjust ASCII architecture diagram alignment in README
+
+- Whitespace and alignment tweaks to the ASCII architecture diagram in readme.md
+- No code or behavior changes; documentation-only edit
+
+## 2026-02-11 - 5.1.1 - fix(release)
+no changes
+
+- No files changed in this commit.
+- Current package version remains 5.1.0 (from package.json).
+
 ## 2026-02-11 - 5.1.0 - feat(mailer-smtp)
 add SCRAM-SHA-256 auth, Ed25519 DKIM, opportunistic TLS, SNI cert selection, pipelining and delivery/bridge improvements
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartmta",
-  "version": "5.1.0",
+  "version": "5.1.3",
   "description": "A high-performance, enterprise-grade Mail Transfer Agent (MTA) built from scratch in TypeScript with Rust acceleration.",
   "keywords": [
     "mta",

readme.md

@@ -1,6 +1,6 @@
 # @push.rocks/smartmta
 
-A high-performance, enterprise-grade Mail Transfer Agent (MTA) built from scratch in TypeScript with a Rust-powered SMTP engine — no nodemailer, no shortcuts. 🚀
+A high-performance, enterprise-grade Mail Transfer Agent (MTA) built from scratch in TypeScript with a Rust-powered SMTP engine — no nodemailer, no shortcuts. Automatic MX record discovery means you just call `sendEmail()` and smartmta figures out where to deliver. 🚀
 
 ## Issue Reporting and Security
 
@@ -43,28 +43,28 @@ After installation, run `pnpm build` to compile the Rust binary (`mailer-bin`).
 
 ```
 ┌──────────────────────────────────────────────────────────────┐
-│                    UnifiedEmailServer                         │
-│     (orchestrates all components, emits events)               │
+│                    UnifiedEmailServer                        │
+│     (orchestrates all components, emits events)              │
 ├───────────┬───────────┬──────────────┬───────────────────────┤
 │   Email   │  Security │  Delivery    │  Configuration        │
 │   Router  │  Stack    │  System      │                       │
-│  ┌──────┐ │ ┌───────┐ │ ┌──────────┐ │  ┌────────────────┐  │
-│  │Match │ │ │ DKIM  │ │ │ Queue    │ │  │ DomainRegistry │  │
-│  │Route │ │ │ SPF   │ │ │ Rate Lim │ │  │ DnsManager     │  │
-│  │ Act  │ │ │ DMARC │ │ │ Retry    │ │  │ DKIMCreator    │  │
-│  └──────┘ │ │ IPRep │ │ └──────────┘ │  │ Templates      │  │
-│           │ │ Scan  │ │              │  └────────────────┘  │
+│  ┌──────┐ │ ┌───────┐ │ ┌──────────┐ │  ┌────────────────┐   │
+│  │Match │ │ │ DKIM  │ │ │ Queue    │ │  │ DomainRegistry │   │
+│  │Route │ │ │ SPF   │ │ │ Rate Lim │ │  │ DnsManager     │   │
+│  │ Act  │ │ │ DMARC │ │ │ Retry    │ │  │ DKIMCreator    │   │
+│  └──────┘ │ │ IPRep │ │ └──────────┘ │  │ Templates      │   │
+│           │ │ Scan  │ │              │  └────────────────┘   │
 │           │ └───────┘ │              │                       │
 ├───────────┴───────────┴──────────────┴───────────────────────┤
-│              Rust Security Bridge (smartrust IPC)             │
+│              Rust Security Bridge (smartrust IPC)            │
 ├──────────────────────────────────────────────────────────────┤
-│                   Rust Acceleration Layer                      │
-│  ┌──────────────┐  ┌───────────────┐  ┌──────────────────┐  │
-│  │ mailer-smtp  │  │mailer-security│  │   mailer-core    │  │
-│  │ SMTP Server  │  │DKIM/SPF/DMARC │  │ Types/Validation │  │
-│  │ SMTP Client  │  │IP Rep/Content │  │ MIME/Bounce      │  │
-│  │ TLS/AUTH     │  │   Scanning    │  │   Detection      │  │
-│  └──────────────┘  └───────────────┘  └──────────────────┘  │
+│                   Rust Acceleration Layer                    │
+│  ┌──────────────┐  ┌───────────────┐  ┌──────────────────┐   │
+│  │ mailer-smtp  │  │mailer-security│  │   mailer-core    │   │
+│  │ SMTP Server  │  │DKIM/SPF/DMARC │  │ Types/Validation │   │
+│  │ SMTP Client  │  │IP Rep/Content │  │ MIME/Bounce      │   │
+│  │ TLS/AUTH     │  │   Scanning    │  │   Detection      │   │
+│  └──────────────┘  └───────────────┘  └──────────────────┘   │
 └──────────────────────────────────────────────────────────────┘
 ```
 
@@ -78,9 +78,10 @@ After installation, run `pnpm build` to compile the Rust binary (`mailer-bin`).
 
 **Data flow for outbound mail:**
 
-1. 📝 TypeScript constructs the email and resolves DKIM keys for the sender domain
-2. 🦀 Sends to Rust via IPC — Rust builds the RFC 2822 message, signs with DKIM, and delivers via its SMTP client with connection pooling
-3. 📬 Result (accepted/rejected recipients, server response) returned to TypeScript
+1. 📝 TypeScript constructs the email and calls `sendEmail()` (defaults to MTA mode)
+2. 🔍 MTA mode automatically resolves MX records for each recipient domain, sorts by priority, and groups recipients for efficient delivery
+3. 🦀 Sends to Rust via IPC — Rust builds the RFC 2822 message, signs with DKIM, and delivers via its SMTP client with connection pooling
+4. 📬 Result (accepted/rejected recipients, server response) returned to TypeScript
 
 ## Usage
 
@@ -169,9 +170,9 @@ await emailServer.start();
 
 > 🔒 **Note:** `start()` will throw if the Rust binary is not compiled. Run `pnpm build` first.
 
-### 📧 Sending Outbound Emails
+### 📧 Sending Emails (Automatic MX Discovery)
 
-All outbound email delivery goes through the Rust SMTP client, accessed via `UnifiedEmailServer.sendOutboundEmail()`. The Rust client handles connection pooling, TLS negotiation, and DKIM signing automatically:
+The recommended way to send email is `sendEmail()`. It defaults to **MTA mode**, which automatically resolves MX records for each recipient domain via DNS — you don't need to know the destination mail server:
 
 ```typescript
 import { Email, UnifiedEmailServer } from '@push.rocks/smartmta';
@@ -179,8 +180,7 @@ import { Email, UnifiedEmailServer } from '@push.rocks/smartmta';
 // Build an email
 const email = new Email({
   from: 'sender@example.com',
-  to: ['recipient@example.com'],
-  cc: ['cc@example.com'],
+  to: ['alice@gmail.com', 'bob@company.org'],
   subject: 'Hello from smartmta! 🚀',
   text: 'Plain text body',
   html: '<h1>Hello!</h1><p>HTML body with <strong>formatting</strong></p>',
@@ -194,7 +194,50 @@ const email = new Email({
   ],
 });
 
-// Send via the Rust SMTP client (connection pooling, TLS, DKIM signing)
+// Send — MTA mode auto-discovers MX servers for gmail.com and company.org
+const emailId = await emailServer.sendEmail(email);
+
+// Optionally specify a delivery mode explicitly
+const emailId2 = await emailServer.sendEmail(email, 'mta');
+```
+
+In MTA mode, smartmta:
+- 🔍 Resolves MX records for each recipient domain (e.g. `gmail.com`, `company.org`)
+- 📊 Sorts MX hosts by priority (lowest = highest priority per RFC 5321)
+- 🔄 Tries each MX host in order until delivery succeeds
+- 🌐 Falls back to the domain's A record if no MX records exist
+- 📦 Groups recipients by domain for efficient batch delivery
+- 🔑 Signs outbound mail with DKIM automatically
+
+### 📮 Delivery Modes
+
+`sendEmail()` accepts a mode parameter that controls how the email is delivered:
+
+```typescript
+public async sendEmail(
+  email: Email,
+  mode: EmailProcessingMode = 'mta',  // 'mta' | 'forward' | 'process'
+  route?: IEmailRoute,
+  options?: {
+    skipSuppressionCheck?: boolean;
+    ipAddress?: string;
+    isTransactional?: boolean;
+  }
+): Promise<string>
+```
+
+| Mode | Description |
+|---|---|
+| `mta` (default) | **Auto MX discovery** — resolves MX records via DNS, delivers directly to the recipient's mail server. No relay configuration needed. |
+| `forward` | **Relay delivery** — forwards the email to a configured SMTP host (e.g. an internal mail gateway or third-party relay). |
+| `process` | **Scan + deliver** — runs the content scanning / security pipeline first, then delivers via auto MX resolution. |
+
+### 📬 Direct SMTP Delivery (Low-Level)
+
+For cases where you know the exact target SMTP server (e.g. relaying to a specific host), use the lower-level `sendOutboundEmail()`:
+
+```typescript
+// Send directly to a known SMTP server (bypasses MX resolution)
 const result = await emailServer.sendOutboundEmail('smtp.example.com', 587, email, {
   auth: { user: 'sender@example.com', pass: 'your-password' },
   dkimDomain: 'example.com',

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartmta',
-  version: '5.1.0',
+  version: '5.1.3',
   description: 'A high-performance, enterprise-grade Mail Transfer Agent (MTA) built from scratch in TypeScript with Rust acceleration.'
 }