diff --git a/package.json b/package.json
index b1a82ca..1a967bd 100644
--- a/package.json
+++ b/package.json
@@ -112,5 +112,10 @@
     "typescript": "^5.8.3",
     "typescript-eslint": "^8.56.1",
     "vite": "^7.3.1"
+  },
+  "pnpm": {
+    "overrides": {
+      "entities": "4.5.0"
+    }
   }
 }
diff --git a/src/lib/email-templates/registry.ts b/src/lib/email-templates/registry.ts
new file mode 100644
index 0000000..715dbed
--- /dev/null
+++ b/src/lib/email-templates/registry.ts
@@ -0,0 +1,23 @@
+import type { ComponentType } from 'react'
+
+export interface TemplateEntry {
+  component: ComponentType<any>
+  subject: string | ((data: Record<string, any>) => string)
+  displayName?: string
+  previewData?: Record<string, any>
+  /** Fixed recipient — overrides caller-provided recipientEmail when set. */
+  to?: string
+}
+
+/**
+ * Template registry — maps template names to their React Email components.
+ * Import and register new templates here after creating them in this directory.
+ *
+ * Example:
+ *   import { template as welcomeTemplate } from './welcome'
+ *   // then add to TEMPLATES: 'welcome': welcomeTemplate
+ */
+export const TEMPLATES: Record<string, TemplateEntry> = {
+  // Add templates here as they are created, e.g.:
+  // 'welcome': welcomeTemplate,
+}
diff --git a/src/routes/email/unsubscribe.ts b/src/routes/email/unsubscribe.ts
new file mode 100644
index 0000000..ecf6b6c
--- /dev/null
+++ b/src/routes/email/unsubscribe.ts
@@ -0,0 +1,152 @@
+import { createClient } from '@supabase/supabase-js'
+import { createFileRoute } from '@tanstack/react-router'
+
+function redactEmail(email: string | null | undefined): string {
+  if (!email) return '***'
+  const [localPart, domain] = email.split('@')
+  if (!localPart || !domain) return '***'
+  return `${localPart[0]}***@${domain}`
+}
+
+export const Route = createFileRoute("/email/unsubscribe")({
+  server: {
+    handlers: {
+      GET: async ({ request }) => {
+        const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
+        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY
+
+        if (!supabaseUrl || !supabaseServiceKey) {
+          return Response.json({ error: 'Server configuration error' }, { status: 500 })
+        }
+
+        // Extract token from query params
+        const url = new URL(request.url)
+        const token = url.searchParams.get('token')
+
+        if (!token) {
+          return Response.json({ error: 'Token is required' }, { status: 400 })
+        }
+
+        const supabase = createClient(supabaseUrl, supabaseServiceKey)
+
+        // Look up the token
+        const { data: tokenRecord, error: lookupError } = await supabase
+          .from('email_unsubscribe_tokens')
+          .select('*')
+          .eq('token', token)
+          .maybeSingle()
+
+        if (lookupError || !tokenRecord) {
+          return Response.json({ error: 'Invalid or expired token' }, { status: 404 })
+        }
+
+        if (tokenRecord.used_at) {
+          return Response.json({ valid: false, reason: 'already_unsubscribed' })
+        }
+
+        return Response.json({ valid: true })
+      },
+
+      POST: async ({ request }) => {
+        const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
+        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY
+
+        if (!supabaseUrl || !supabaseServiceKey) {
+          return Response.json({ error: 'Server configuration error' }, { status: 500 })
+        }
+
+        // Extract token from query params (always present for RFC 8058 one-click)
+        const url = new URL(request.url)
+        let token: string | null = url.searchParams.get('token')
+
+        // Detect RFC 8058 one-click unsubscribe: POST with form-encoded body
+        // containing "List-Unsubscribe=One-Click". Email clients (Gmail, Apple Mail,
+        // etc.) send this when the user clicks "Unsubscribe" in the mail UI.
+        const contentType = request.headers.get('content-type') ?? ''
+        if (contentType.includes('application/x-www-form-urlencoded')) {
+          const formText = await request.text()
+          const params = new URLSearchParams(formText)
+          // For one-click, token comes from query param (already set above).
+          // Otherwise, token may be in the form body.
+          if (!params.get('List-Unsubscribe')) {
+            const formToken = params.get('token')
+            if (formToken) {
+              token = formToken
+            }
+          }
+        } else {
+          // JSON body (from the app's unsubscribe page)
+          try {
+            const body = await request.json()
+            if (body.token) {
+              token = body.token
+            }
+          } catch {
+            // Fall through — token stays from query param
+          }
+        }
+
+        if (!token) {
+          return Response.json({ error: 'Token is required' }, { status: 400 })
+        }
+
+        const supabase = createClient(supabaseUrl, supabaseServiceKey)
+
+        // Look up the token
+        const { data: tokenRecord, error: lookupError } = await supabase
+          .from('email_unsubscribe_tokens')
+          .select('*')
+          .eq('token', token)
+          .maybeSingle()
+
+        if (lookupError || !tokenRecord) {
+          return Response.json({ error: 'Invalid or expired token' }, { status: 404 })
+        }
+
+        if (tokenRecord.used_at) {
+          return Response.json({ success: false, reason: 'already_unsubscribed' })
+        }
+
+        // Atomic check-and-update to avoid TOCTOU race
+        const { data: updated, error: updateError } = await supabase
+          .from('email_unsubscribe_tokens')
+          .update({ used_at: new Date().toISOString() })
+          .eq('token', token)
+          .is('used_at', null)
+          .select()
+          .maybeSingle()
+
+        if (updateError) {
+          console.error('Failed to mark token as used', { error: updateError, token })
+          return Response.json({ error: 'Failed to process unsubscribe' }, { status: 500 })
+        }
+
+        if (!updated) {
+          return Response.json({ success: false, reason: 'already_unsubscribed' })
+        }
+
+        // Add email to suppressed list (upsert to handle duplicates)
+        const { error: suppressError } = await supabase
+          .from('suppressed_emails')
+          .upsert(
+            { email: tokenRecord.email.toLowerCase(), reason: 'unsubscribe' },
+            { onConflict: 'email' },
+          )
+
+        if (suppressError) {
+          console.error('Failed to suppress email', {
+            error: suppressError,
+            email_redacted: redactEmail(tokenRecord.email),
+          })
+          return Response.json({ error: 'Failed to process unsubscribe' }, { status: 500 })
+        }
+
+        console.log('Email unsubscribed', {
+          email_redacted: redactEmail(tokenRecord.email),
+        })
+
+        return Response.json({ success: true })
+      },
+    },
+  },
+})
diff --git a/src/routes/lovable/email/suppression.ts b/src/routes/lovable/email/suppression.ts
new file mode 100644
index 0000000..402ede4
--- /dev/null
+++ b/src/routes/lovable/email/suppression.ts
@@ -0,0 +1,158 @@
+import { createClient } from '@supabase/supabase-js'
+import { WebhookError, verifyWebhookRequest } from '@lovable.dev/webhooks-js'
+import { createFileRoute } from '@tanstack/react-router'
+
+// Suppression event payload sent by the Go API when Mailgun reports
+// a bounce, complaint, or unsubscribe.
+interface SuppressionPayload {
+  email: string
+  reason: 'bounce' | 'complaint' | 'unsubscribe'
+  message_id?: string
+  metadata?: Record<string, unknown>
+  is_retry: boolean
+  retry_count: number
+}
+
+function parseSuppressionPayload(body: string): SuppressionPayload {
+  const parsed = JSON.parse(body)
+  if (!parsed.data) {
+    throw new Error('Missing data field in payload')
+  }
+  const data = parsed.data as SuppressionPayload
+  if (!data.email || !data.reason) {
+    throw new Error('Missing required fields: email, reason')
+  }
+  return data
+}
+
+function mapReasonToStatus(
+  reason: string,
+): 'bounced' | 'complained' | 'suppressed' {
+  switch (reason) {
+    case 'bounce':
+      return 'bounced'
+    case 'complaint':
+      return 'complained'
+    default:
+      return 'suppressed'
+  }
+}
+
+function mapReasonToMessage(reason: string): string {
+  switch (reason) {
+    case 'bounce':
+      return 'Permanent bounce — email address is invalid or rejected'
+    case 'complaint':
+      return 'Spam complaint — recipient marked email as spam'
+    case 'unsubscribe':
+      return 'Recipient unsubscribed'
+    default:
+      return 'Email suppressed'
+  }
+}
+
+export const Route = createFileRoute("/lovable/email/suppression")({
+  server: {
+    handlers: {
+      POST: async ({ request }) => {
+        const apiKey = process.env.LOVABLE_API_KEY
+        const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
+        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY
+
+        if (!apiKey || !supabaseUrl || !supabaseServiceKey) {
+          console.error('Missing required environment variables')
+          return Response.json({ error: 'Server configuration error' }, { status: 500 })
+        }
+
+        // Verify HMAC signature using the Lovable API Key (same as auth-email-hook)
+        let payload: SuppressionPayload
+        try {
+          const verified = await verifyWebhookRequest({
+            req: request,
+            secret: apiKey,
+            parser: parseSuppressionPayload,
+          })
+          payload = verified.payload
+        } catch (error) {
+          if (error instanceof WebhookError) {
+            switch (error.code) {
+              case 'invalid_signature':
+                console.error('Invalid webhook signature')
+                return Response.json({ error: 'Invalid signature' }, { status: 401 })
+              case 'stale_timestamp':
+                console.error('Stale webhook timestamp')
+                return Response.json({ error: 'Stale timestamp' }, { status: 401 })
+              case 'invalid_payload':
+              case 'invalid_json':
+                console.error('Invalid payload', { code: error.code })
+                return Response.json({ error: 'Invalid payload' }, { status: 400 })
+              default:
+                console.error('Webhook verification failed', {
+                  code: error.code,
+                  message: error.message,
+                })
+                return Response.json({ error: 'Verification failed' }, { status: 401 })
+            }
+          }
+          console.error('Unexpected error during verification', { error })
+          return Response.json({ error: 'Internal error' }, { status: 500 })
+        }
+
+        const supabase = createClient(supabaseUrl, supabaseServiceKey)
+        const normalizedEmail = payload.email.toLowerCase()
+
+        // 1. Upsert to suppressed_emails (idempotent — safe for retries)
+        const { error: suppressError } = await supabase
+          .from('suppressed_emails')
+          .upsert(
+            {
+              email: normalizedEmail,
+              reason: payload.reason,
+              metadata: payload.metadata ?? null,
+            },
+            { onConflict: 'email' },
+          )
+
+        if (suppressError) {
+          console.error('Failed to upsert suppressed email', {
+            error: suppressError,
+            email_redacted: normalizedEmail[0] + '***@' + normalizedEmail.split('@')[1],
+          })
+          return Response.json({ error: 'Failed to write suppression' }, { status: 500 })
+        }
+
+        // 2. Append a new log entry for the suppression event (never update existing rows)
+        const sendLogStatus = mapReasonToStatus(payload.reason)
+        const sendLogMessage = mapReasonToMessage(payload.reason)
+
+        const { error: insertError } = await supabase
+          .from('email_send_log')
+          .insert({
+            message_id: payload.message_id ?? null,
+            template_name: 'system',
+            recipient_email: normalizedEmail,
+            status: sendLogStatus,
+            error_message: sendLogMessage,
+            metadata: payload.metadata ?? null,
+          })
+
+        if (insertError) {
+          // Non-fatal — log and continue. The suppression was already recorded.
+          console.warn('Failed to insert email_send_log', {
+            error: insertError,
+          })
+        }
+
+        console.log('Suppression processed', {
+          email_redacted: normalizedEmail[0] + '***@' + normalizedEmail.split('@')[1],
+          reason: payload.reason,
+          is_retry: payload.is_retry,
+          retry_count: payload.retry_count,
+          has_message_id: !!payload.message_id,
+        })
+
+        return Response.json({ success: true })
+      },
+    },
+  },
+})
diff --git a/src/routes/lovable/email/transactional/preview.ts b/src/routes/lovable/email/transactional/preview.ts
new file mode 100644
index 0000000..376d2d1
--- /dev/null
+++ b/src/routes/lovable/email/transactional/preview.ts
@@ -0,0 +1,89 @@
+import * as React from 'react'
+import { renderAsync } from '@react-email/components'
+import { createFileRoute } from '@tanstack/react-router'
+import { TEMPLATES } from '@/lib/email-templates/registry'
+
+// Renders all registered templates with their previewData.
+// Gated by LOVABLE_API_KEY — only the Go API calls this.
+
+export const Route = createFileRoute("/lovable/email/transactional/preview")({
+  server: {
+    handlers: {
+      POST: async ({ request }) => {
+        const apiKey = process.env.LOVABLE_API_KEY
+        if (!apiKey) {
+          return Response.json(
+            { error: 'Server configuration error' },
+            { status: 500 }
+          )
+        }
+
+        // Verify the caller is authorized with LOVABLE_API_KEY
+        const authHeader = request.headers.get('Authorization')
+        const token = authHeader?.replace(/^Bearer\s+/i, '')
+        if (token !== apiKey) {
+          return Response.json({ error: 'Unauthorized' }, { status: 401 })
+        }
+
+        const templateNames = Object.keys(TEMPLATES)
+        const results: Array<{
+          templateName: string
+          displayName: string
+          subject: string
+          html: string
+          status: 'ready' | 'preview_data_required' | 'render_failed'
+          errorMessage?: string
+        }> = []
+
+        for (const name of templateNames) {
+          const entry = TEMPLATES[name]
+          const displayName = entry.displayName || name
+
+          if (!entry.previewData) {
+            results.push({
+              templateName: name,
+              displayName,
+              subject: '',
+              html: '',
+              status: 'preview_data_required',
+            })
+            continue
+          }
+
+          try {
+            const html = await renderAsync(
+              React.createElement(entry.component, entry.previewData)
+            )
+            const resolvedSubject =
+              typeof entry.subject === 'function'
+                ? entry.subject(entry.previewData)
+                : entry.subject
+
+            results.push({
+              templateName: name,
+              displayName,
+              subject: resolvedSubject,
+              html,
+              status: 'ready',
+            })
+          } catch (err) {
+            console.error('Failed to render template for preview', {
+              template: name,
+              error: err,
+            })
+            results.push({
+              templateName: name,
+              displayName,
+              subject: '',
+              html: '',
+              status: 'render_failed',
+              errorMessage: err instanceof Error ? err.message : String(err),
+            })
+          }
+        }
+
+        return Response.json({ templates: results })
+      },
+    },
+  },
+})
diff --git a/src/routes/lovable/email/transactional/send.ts b/src/routes/lovable/email/transactional/send.ts
new file mode 100644
index 0000000..5501887
--- /dev/null
+++ b/src/routes/lovable/email/transactional/send.ts
@@ -0,0 +1,324 @@
+import * as React from 'react'
+import { renderAsync } from '@react-email/components'
+import { createClient } from '@supabase/supabase-js'
+import { createFileRoute } from '@tanstack/react-router'
+import { TEMPLATES } from '@/lib/email-templates/registry'
+
+// Configuration baked in at scaffold time
+const SITE_NAME = "hoa-guard-desk"
+// SENDER_DOMAIN is the verified sender subdomain FQDN (e.g., "notify.example.com").
+// It MUST match the subdomain delegated to Lovable's nameservers. NEVER use the root domain.
+const SENDER_DOMAIN = "notify.stagelaw.com"
+// FROM_DOMAIN is the domain shown in the From: header (e.g., "example.com").
+// Can be the root domain when display_from_root is enabled — this is cosmetic only.
+const FROM_DOMAIN = "notify.stagelaw.com"
+
+function redactEmail(email: string | null | undefined): string {
+  if (!email) return '***'
+  const [localPart, domain] = email.split('@')
+  if (!localPart || !domain) return '***'
+  return `${localPart[0]}***@${domain}`
+}
+
+// Generate a cryptographically random 32-byte hex token
+function generateToken(): string {
+  const bytes = new Uint8Array(32)
+  crypto.getRandomValues(bytes)
+  return Array.from(bytes)
+    .map((b) => b.toString(16).padStart(2, '0'))
+    .join('')
+}
+
+export const Route = createFileRoute("/lovable/email/transactional/send")({
+  server: {
+    handlers: {
+      POST: async ({ request }) => {
+        const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
+        const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY
+
+        if (!supabaseUrl || !supabaseServiceKey) {
+          console.error('Missing required environment variables')
+          return Response.json(
+            { error: 'Server configuration error' },
+            { status: 500 }
+          )
+        }
+
+        // Verify the caller has a valid Supabase auth token.
+        // In TanStack, there is no Supabase gateway — we validate the JWT ourselves.
+        const authHeader = request.headers.get('Authorization')
+        if (!authHeader?.startsWith('Bearer ')) {
+          return Response.json({ error: 'Unauthorized' }, { status: 401 })
+        }
+
+        const token = authHeader.slice('Bearer '.length).trim()
+        const supabase = createClient(supabaseUrl, supabaseServiceKey)
+        const { data: { user }, error: authError } = await supabase.auth.getUser(token)
+
+        if (authError || !user) {
+          return Response.json({ error: 'Unauthorized' }, { status: 401 })
+        }
+
+        // Parse request body
+        let templateName: string
+        let recipientEmail: string
+        let idempotencyKey: string
+        let messageId: string
+        let templateData: Record<string, any> = {}
+        try {
+          const body = await request.json()
+          templateName = body.templateName || body.template_name
+          recipientEmail = body.recipientEmail || body.recipient_email
+          messageId = crypto.randomUUID()
+          idempotencyKey = body.idempotencyKey || body.idempotency_key || messageId
+          if (body.templateData && typeof body.templateData === 'object') {
+            templateData = body.templateData
+          }
+        } catch {
+          return Response.json(
+            { error: 'Invalid JSON in request body' },
+            { status: 400 }
+          )
+        }
+
+        if (!templateName) {
+          return Response.json(
+            { error: 'templateName is required' },
+            { status: 400 }
+          )
+        }
+
+        // 1. Look up template from registry (early — needed to resolve recipient)
+        const template = TEMPLATES[templateName]
+
+        if (!template) {
+          console.error('Template not found in registry', { templateName })
+          return Response.json(
+            {
+              error: `Template '${templateName}' not found. Available: ${Object.keys(TEMPLATES).join(', ')}`,
+            },
+            { status: 404 }
+          )
+        }
+
+        // Resolve effective recipient: template-level `to` takes precedence over
+        // the caller-provided recipientEmail. This allows notification templates
+        // to always send to a fixed address (e.g., site owner from env var).
+        const effectiveRecipient = template.to || recipientEmail
+
+        if (!effectiveRecipient) {
+          return Response.json(
+            {
+              error: 'recipientEmail is required (unless the template defines a fixed recipient)',
+            },
+            { status: 400 }
+          )
+        }
+
+        // 2. Check suppression list (fail-closed: if we can't verify, don't send)
+        const { data: suppressed, error: suppressionError } = await supabase
+          .from('suppressed_emails')
+          .select('id')
+          .eq('email', effectiveRecipient.toLowerCase())
+          .maybeSingle()
+
+        if (suppressionError) {
+          console.error('Suppression check failed — refusing to send', {
+            error: suppressionError,
+            recipient_redacted: redactEmail(effectiveRecipient),
+          })
+          return Response.json(
+            { error: 'Failed to verify suppression status' },
+            { status: 500 }
+          )
+        }
+
+        if (suppressed) {
+          // Log the suppressed attempt
+          await supabase.from('email_send_log').insert({
+            message_id: messageId,
+            template_name: templateName,
+            recipient_email: effectiveRecipient,
+            status: 'suppressed',
+          })
+
+          console.log('Email suppressed', {
+            templateName,
+            recipient_redacted: redactEmail(effectiveRecipient),
+          })
+          return Response.json({ success: false, reason: 'email_suppressed' })
+        }
+
+        // 3. Get or create unsubscribe token (one token per email address)
+        const normalizedEmail = effectiveRecipient.toLowerCase()
+        let unsubscribeToken: string
+
+        // Check for existing token for this email
+        const { data: existingToken, error: tokenLookupError } = await supabase
+          .from('email_unsubscribe_tokens')
+          .select('token, used_at')
+          .eq('email', normalizedEmail)
+          .maybeSingle()
+
+        if (tokenLookupError) {
+          console.error('Token lookup failed', {
+            error: tokenLookupError,
+            email_redacted: redactEmail(normalizedEmail),
+          })
+          await supabase.from('email_send_log').insert({
+            message_id: messageId,
+            template_name: templateName,
+            recipient_email: effectiveRecipient,
+            status: 'failed',
+            error_message: 'Failed to look up unsubscribe token',
+          })
+          return Response.json(
+            { error: 'Failed to prepare email' },
+            { status: 500 }
+          )
+        }
+
+        if (existingToken && !existingToken.used_at) {
+          // Reuse existing unused token
+          unsubscribeToken = existingToken.token
+        } else if (!existingToken) {
+          // Create new token — upsert handles concurrent inserts gracefully
+          unsubscribeToken = generateToken()
+          const { error: tokenError } = await supabase
+            .from('email_unsubscribe_tokens')
+            .upsert(
+              { token: unsubscribeToken, email: normalizedEmail },
+              { onConflict: 'email', ignoreDuplicates: true }
+            )
+
+          if (tokenError) {
+            console.error('Failed to create unsubscribe token', {
+              error: tokenError,
+            })
+            await supabase.from('email_send_log').insert({
+              message_id: messageId,
+              template_name: templateName,
+              recipient_email: effectiveRecipient,
+              status: 'failed',
+              error_message: 'Failed to create unsubscribe token',
+            })
+            return Response.json(
+              { error: 'Failed to prepare email' },
+              { status: 500 }
+            )
+          }
+
+          // If another request raced us, our upsert was silently ignored.
+          // Re-read to get the actual stored token.
+          const { data: storedToken, error: reReadError } = await supabase
+            .from('email_unsubscribe_tokens')
+            .select('token')
+            .eq('email', normalizedEmail)
+            .maybeSingle()
+
+          if (reReadError || !storedToken) {
+            console.error('Failed to read back unsubscribe token after upsert', {
+              error: reReadError,
+              email_redacted: redactEmail(normalizedEmail),
+            })
+            await supabase.from('email_send_log').insert({
+              message_id: messageId,
+              template_name: templateName,
+              recipient_email: effectiveRecipient,
+              status: 'failed',
+              error_message: 'Failed to confirm unsubscribe token storage',
+            })
+            return Response.json(
+              { error: 'Failed to prepare email' },
+              { status: 500 }
+            )
+          }
+          unsubscribeToken = storedToken.token
+        } else {
+          // Token exists but is already used — email should have been caught by suppression check above.
+          // This is a safety fallback; log and skip sending.
+          console.warn('Unsubscribe token already used but email not suppressed', {
+            email_redacted: redactEmail(normalizedEmail),
+          })
+          await supabase.from('email_send_log').insert({
+            message_id: messageId,
+            template_name: templateName,
+            recipient_email: effectiveRecipient,
+            status: 'suppressed',
+            error_message:
+              'Unsubscribe token used but email missing from suppressed list',
+          })
+          return Response.json({ success: false, reason: 'email_suppressed' })
+        }
+
+        // 4. Render React Email template to HTML and plain text
+        const element = React.createElement(template.component, templateData)
+        const html = await renderAsync(element)
+        const plainText = await renderAsync(element, { plainText: true })
+
+        // Resolve subject — supports static string or dynamic function
+        const resolvedSubject =
+          typeof template.subject === 'function'
+            ? template.subject(templateData)
+            : template.subject
+
+        // 5. Enqueue the pre-rendered email for async processing by the dispatcher.
+        // The dispatcher (process-email-queue) handles sending, retries, and rate-limit backoff.
+
+        // Log pending BEFORE enqueue so we have a record even if enqueue crashes
+        await supabase.from('email_send_log').insert({
+          message_id: messageId,
+          template_name: templateName,
+          recipient_email: effectiveRecipient,
+          status: 'pending',
+        })
+
+        const { error: enqueueError } = await supabase.rpc('enqueue_email', {
+          queue_name: 'transactional_emails',
+          payload: {
+            message_id: messageId,
+            to: effectiveRecipient,
+            from: `${SITE_NAME} <noreply@${FROM_DOMAIN}>`,
+            sender_domain: SENDER_DOMAIN,
+            subject: resolvedSubject,
+            html,
+            text: plainText,
+            purpose: 'transactional',
+            label: templateName,
+            idempotency_key: idempotencyKey,
+            unsubscribe_token: unsubscribeToken,
+            queued_at: new Date().toISOString(),
+          },
+        })
+
+        if (enqueueError) {
+          console.error('Failed to enqueue email', {
+            error: enqueueError,
+            templateName,
+            recipient_redacted: redactEmail(effectiveRecipient),
+          })
+
+          await supabase.from('email_send_log').insert({
+            message_id: messageId,
+            template_name: templateName,
+            recipient_email: effectiveRecipient,
+            status: 'failed',
+            error_message: 'Failed to enqueue email',
+          })
+
+          return Response.json(
+            { error: 'Failed to enqueue email' },
+            { status: 500 }
+          )
+        }
+
+        console.log('Transactional email enqueued', {
+          templateName,
+          recipient_redacted: redactEmail(effectiveRecipient),
+        })
+
+        return Response.json({ success: true, queued: true })
+      },
+    },
+  },
+})