diff --git a/go.mod b/go.mod
index 3bc0bb1..70996dc 100644
--- a/go.mod
+++ b/go.mod
@@ -16,6 +16,7 @@ require (
 	github.com/xdg-go/scram v1.2.0 // indirect
 	github.com/xdg-go/stringprep v1.0.4 // indirect
 	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
+	github.com/yuin/goldmark v1.8.6 // indirect
 	golang.org/x/net v0.56.0 // indirect
 	golang.org/x/sync v0.22.0 // indirect
 	golang.org/x/sys v0.47.0 // indirect
diff --git a/go.sum b/go.sum
index 68a74c1..8f81fc0 100644
--- a/go.sum
+++ b/go.sum
@@ -21,6 +21,8 @@ github.com/xdg-go/stringprep v1.0.4/go.mod h1:mPGuuIYwz7CmR2bT9j4GbQqutWS1zV24gi
 github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 h1:ilQV1hzziu+LLM3zUTJ0trRztfwgjqKnBWNtSRkbmwM=
 github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78/go.mod h1:aL8wCCfTfSfmXjznFBSZNN13rSJjlIOI1fUNAtF7rmI=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+github.com/yuin/goldmark v1.8.6 h1:d0VcaP1sx9GkFVkoW+KtggpGi2KZ965i14b0+bDQST4=
+github.com/yuin/goldmark v1.8.6/go.mod h1:ip/1k0VRfGynBgxOz0yCqHrbZXhcjxyuS66Brc7iBKg=
 go.mongodb.org/mongo-driver/v2 v2.8.0 h1:CxWDGQYY8QQwNjAl/aq2sfWakdnWZynnqJ9F4DhHbP8=
 go.mongodb.org/mongo-driver/v2 v2.8.0/go.mod h1:yOI9kBsufol30iFsl1slpdq1I0eHPzybRWdyYUs8K/0=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
diff --git a/mail/announcement.go b/mail/announcement.go
new file mode 100644
index 0000000..afc4316
--- /dev/null
+++ b/mail/announcement.go
@@ -0,0 +1,69 @@
+package mail
+
+import (
+	"bytes"
+	"fmt"
+	htmltmpl "html/template"
+	"strings"
+
+	"github.com/yuin/goldmark"
+)
+
+// Announcement is one product email to one person: a feature launch, a guide,
+// an offer. vantage-admin's announce package builds it per recipient, because
+// the unsubscribe links carry that person's token.
+type Announcement struct {
+	CategoryLabel  string // "New features"
+	Subject        string
+	BodyMarkdown   string
+	UnsubscribeURL string // RFC 8058 one-click target for this category
+	PreferencesURL string // the no-login preferences page
+	PostalAddress  string // optional footer line
+}
+
+type announcementData struct {
+	Announcement
+	BodyHTML htmltmpl.HTML
+}
+
+// md renders with goldmark's defaults, which omit raw HTML: a pasted <script>
+// never reaches an inbox.
+var md = goldmark.New()
+
+func announcementMessage(a Announcement, publicURL string) (message, error) {
+	var buf bytes.Buffer
+	if err := md.Convert([]byte(a.BodyMarkdown), &buf); err != nil {
+		return message{}, fmt.Errorf("mail: markdown: %w", err)
+	}
+	return render("announcement", announcementData{Announcement: a, BodyHTML: htmltmpl.HTML(buf.String())}, publicURL)
+}
+
+// RenderAnnouncement is the staff preview: exactly what a recipient gets.
+func RenderAnnouncement(a Announcement, publicURL string) (subject, html, text string, err error) {
+	m, err := announcementMessage(a, publicURL)
+	if err != nil {
+		return "", "", "", err
+	}
+	return m.Subject, m.HTML, m.Text, nil
+}
+
+// SendAnnouncement sends one announcement to one address, with the
+// List-Unsubscribe pair Gmail and Yahoo require of bulk senders.
+func (s Sender) SendAnnouncement(to string, a Announcement) error {
+	if strings.Contains(to, ",") {
+		return fmt.Errorf("mail: an announcement goes to exactly one address")
+	}
+	if a.UnsubscribeURL == "" {
+		return fmt.Errorf("mail: announcement without an unsubscribe URL")
+	}
+	m, err := announcementMessage(a, s.PublicURL)
+	if err != nil {
+		return err
+	}
+	m.To = to
+	m.Headers = map[string]string{
+		"List-Unsubscribe":      "<" + a.UnsubscribeURL + ">",
+		"List-Unsubscribe-Post": "List-Unsubscribe=One-Click",
+	}
+	return s.send(m)
+}
diff --git a/mail/announcement_test.go b/mail/announcement_test.go
new file mode 100644
index 0000000..43bde96
--- /dev/null
+++ b/mail/announcement_test.go
@@ -0,0 +1,70 @@
+package mail
+
+import (
+	"strings"
+	"testing"
+)
+
+func sampleAnnouncement() Announcement {
+	return Announcement{
+		CategoryLabel:  "New features",
+		Subject:        "New in Vantage: scheduled workflows",
+		BodyMarkdown:   "Workflows can now run **on a schedule**.\n\n<script>alert(1)</script>\n\n- cron syntax\n- time zones",
+		UnsubscribeURL: "https://api.example/email/unsubscribe?c=features&t=abc",
+		PreferencesURL: "https://hq.example/email-preferences?t=abc",
+		PostalAddress:  "Hostxtra Ltd, 1 High Street, Leeds",
+	}
+}
+
+func TestRenderAnnouncement(t *testing.T) {
+	subject, html, text, err := RenderAnnouncement(sampleAnnouncement(), "https://hq.example")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if subject != "New in Vantage: scheduled workflows" {
+		t.Errorf("subject = %q", subject)
+	}
+	if !strings.Contains(html, "<strong>on a schedule</strong>") {
+		t.Error("markdown not rendered to html")
+	}
+	if strings.Contains(html, "<script>") {
+		t.Error("raw html from markdown reached the email")
+	}
+	for label, body := range map[string]string{"html": html, "text": text} {
+		for _, want := range []string{"email/unsubscribe?c=features", "email-preferences?t=abc", "New features", "Hostxtra Ltd"} {
+			if !strings.Contains(body, want) {
+				t.Errorf("%s body missing %q", label, want)
+			}
+		}
+		if strings.Contains(body, "—") {
+			t.Errorf("%s body contains an em dash", label)
+		}
+	}
+	if !strings.Contains(text, "**on a schedule**") {
+		t.Error("text part should carry the markdown source")
+	}
+}
+
+func TestRenderAnnouncementWithoutPostalAddress(t *testing.T) {
+	a := sampleAnnouncement()
+	a.PostalAddress = ""
+	_, html, _, err := RenderAnnouncement(a, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if strings.Contains(html, "<no value>") {
+		t.Error("empty postal address rendered as <no value>")
+	}
+}
+
+func TestSendAnnouncementRefusesListsAndMissingLink(t *testing.T) {
+	s := Sender{Host: "smtp.invalid", From: "updates@example.com"}
+	if err := s.SendAnnouncement("a@example.com, b@example.com", sampleAnnouncement()); err == nil {
+		t.Error("a comma-separated To must be refused")
+	}
+	a := sampleAnnouncement()
+	a.UnsubscribeURL = ""
+	if err := s.SendAnnouncement("a@example.com", a); err == nil {
+		t.Error("an announcement without an unsubscribe URL must be refused")
+	}
+}
diff --git a/mail/render_test.go b/mail/render_test.go
index cfc169d..c689ae0 100644
--- a/mail/render_test.go
+++ b/mail/render_test.go
@@ -20,18 +20,18 @@ func cases() map[string]any {
 		"invite":       s.inviteData("sam@example.com", "Northwind Ops", "8a1b2c3d4e"),
 		"license": licenseData("northwind-prod",
 			"eyJ2IjoxLCJpbnN0YW5jZSI6Im5vcnRod2luZC1wcm9kIiwidGllciI6ImZyZWUiLCJleHAiOjE3OTk5OTk5OTl9.MEUCIQDk3v1rX0sX7kQ2m9WQ1o0q8pWm6lq3vRjz8yN0yX4bGQIgYk2Fh7s"),
-		"instanceready":           instanceReadyData("northwind-prod", "https://northwind-prod.vantage.hostxtra.co.uk", now.Add(30*day)),
-		"instanceready/nologin":   instanceReadyData("northwind-prod", "", now.Add(30*day)),
-		"renewed":                 renewedData("northwind-prod", now.Add(30*day)),
-		"expiring":                expiringData("northwind-prod", s.PublicURL, now.Add(7*day)),
-		"expired":                 expiredData("northwind-prod", s.PublicURL, now.Add(14*day)),
-		"expired/noreaper":        expiredData("northwind-prod", s.PublicURL, time.Time{}),
-		"deletionwarning":         deletionWarningData("northwind-prod", s.PublicURL, now.Add(7*day), 7),
-		"deletionwarning/1day":    deletionWarningData("northwind-prod", s.PublicURL, now.Add(day), 1),
-		"cancelled":               s.billingData("northwind-prod"),
-		"pastdue":                 s.billingData("northwind-prod"),
-		"monitoralert":            MonitorEvent{MonitorName: "api.northwind.io", Type: "http", OldStatus: "up", NewStatus: "down", Message: "GET /healthz returned 503 Service Unavailable after 2.4s", Time: now, Down: true},
-		"monitoralert/recovered":  MonitorEvent{MonitorName: "api.northwind.io", Type: "http", OldStatus: "down", NewStatus: "up", Message: "200 OK in 182ms", Time: now},
+		"instanceready":          instanceReadyData("northwind-prod", "https://northwind-prod.vantage.hostxtra.co.uk", now.Add(30*day)),
+		"instanceready/nologin":  instanceReadyData("northwind-prod", "", now.Add(30*day)),
+		"renewed":                renewedData("northwind-prod", now.Add(30*day)),
+		"expiring":               expiringData("northwind-prod", s.PublicURL, now.Add(7*day)),
+		"expired":                expiredData("northwind-prod", s.PublicURL, now.Add(14*day)),
+		"expired/noreaper":       expiredData("northwind-prod", s.PublicURL, time.Time{}),
+		"deletionwarning":        deletionWarningData("northwind-prod", s.PublicURL, now.Add(7*day), 7),
+		"deletionwarning/1day":   deletionWarningData("northwind-prod", s.PublicURL, now.Add(day), 1),
+		"cancelled":              s.billingData("northwind-prod"),
+		"pastdue":                s.billingData("northwind-prod"),
+		"monitoralert":           MonitorEvent{MonitorName: "api.northwind.io", Type: "http", OldStatus: "up", NewStatus: "down", Message: "GET /healthz returned 503 Service Unavailable after 2.4s", Time: now, Down: true},
+		"monitoralert/recovered": MonitorEvent{MonitorName: "api.northwind.io", Type: "http", OldStatus: "down", NewStatus: "up", Message: "200 OK in 182ms", Time: now},
 		"contact": struct {
 			Enquiry
 			Received string
@@ -47,6 +47,10 @@ func cases() map[string]any {
 				{CVEID: "CVE-2025-48112", Severity: "low", PackageName: "less", ServerName: "worker-03"},
 			},
 			More: 9, DBAge: "2 days"},
+		"announcement": announcementData{
+			Announcement: sampleAnnouncement(),
+			BodyHTML:     "<p>Workflows can now run <strong>on a schedule</strong>.</p>",
+		},
 		"accountlocked":     sampleNotice(),
 		"disputereminder":   sampleNotice(),
 		"accountterminated": sampleNotice(),
diff --git a/mail/templates/announcement.html.tmpl b/mail/templates/announcement.html.tmpl
new file mode 100644
index 0000000..2c40c45
--- /dev/null
+++ b/mail/templates/announcement.html.tmpl
@@ -0,0 +1,9 @@
+{{define "tone"}}accent{{end}}
+{{define "category"}}{{.CategoryLabel}}{{end}}
+{{define "pill"}}{{template "chip" (dict "label" .CategoryLabel "tone" "accent")}}{{end}}
+{{define "title"}}{{.Subject}}{{end}}
+{{define "body"}}
+<div style="color:#e4ecf6;font-size:15px;line-height:1.6;">{{.BodyHTML}}</div>
+<p style="margin:24px 0 0;color:#71879f;font-size:12px;line-height:1.6;"><a href="{{.UnsubscribeURL}}" style="color:#9fb3ca;">Unsubscribe from {{.CategoryLabel}}</a> &middot; <a href="{{.PreferencesURL}}" style="color:#9fb3ca;">Email preferences</a>{{if .PostalAddress}}<br>{{.PostalAddress}}{{end}}</p>
+{{end}}
+{{define "why"}}you have a Vantage account and are subscribed to {{.CategoryLabel}}. Account emails such as sign-in, licences and billing are sent whatever you choose here.{{end}}
diff --git a/mail/templates/announcement.txt.tmpl b/mail/templates/announcement.txt.tmpl
new file mode 100644
index 0000000..03b386a
--- /dev/null
+++ b/mail/templates/announcement.txt.tmpl
@@ -0,0 +1,13 @@
+{{define "subject"}}{{.Subject}}{{end}}
+{{define "tone"}}accent{{end}}
+{{define "category"}}{{.CategoryLabel}}{{end}}
+{{define "pill"}}{{template "chip" (dict "label" .CategoryLabel "tone" "accent")}}{{end}}
+{{define "title"}}{{.Subject}}{{end}}
+{{define "body"}}
+{{.BodyMarkdown}}
+
+Unsubscribe from {{.CategoryLabel}}: {{.UnsubscribeURL}}
+Email preferences: {{.PreferencesURL}}
+{{if .PostalAddress}}{{.PostalAddress}}{{end}}
+{{end}}
+{{define "why"}}you have a Vantage account and are subscribed to {{.CategoryLabel}}. Account emails such as sign-in, licences and billing are sent whatever you choose here.{{end}}