diff --git a/internal/access/service.go b/internal/access/service.go
index 7010ba2..7197386 100644
--- a/internal/access/service.go
+++ b/internal/access/service.go
@@ -181,7 +181,8 @@ func Allows(policy *models.DomainAccessConfig, email string) bool {
 	}
 	email = normalizeEmail(email)
 	for _, allowed := range policy.AllowedEmails {
-		if normalizeEmail(allowed) == email {
+		allowed = normalizeEmail(allowed)
+		if allowed == email || strings.HasPrefix(allowed, "@") && allowed == emailDomain(email) {
 			return true
 		}
 	}
@@ -194,6 +195,23 @@ func ValidEmail(value string) bool {
 	return err == nil && strings.EqualFold(address.Address, value)
 }
 
+// ValidAllowlistEntry accepts a complete email address or an exact domain prefixed with @.
+// YAML producers must quote domain entries because @ is a reserved leading indicator.
+func ValidAllowlistEntry(value string) bool {
+	value = strings.TrimSpace(value)
+	if strings.HasPrefix(value, "@") {
+		return len(value) > 1 && ValidEmail("access"+value)
+	}
+	return ValidEmail(value)
+}
+
+func emailDomain(value string) string {
+	if index := strings.LastIndexByte(value, '@'); index >= 0 {
+		return value[index:]
+	}
+	return ""
+}
+
 func (s *Service) sign(payload tokenPayload) (string, error) {
 	data, err := json.Marshal(payload)
 	if err != nil {
diff --git a/internal/access/service_test.go b/internal/access/service_test.go
index 81bba35..1fa65e2 100644
--- a/internal/access/service_test.go
+++ b/internal/access/service_test.go
@@ -73,6 +73,34 @@ func TestAnyVerifiedPolicyRequiresOneValidEmailAddress(t *testing.T) {
 	}
 }
 
+func TestAllowlistAcceptsExactEmailDomains(t *testing.T) {
+	policy := &models.DomainAccessConfig{
+		Enabled:       true,
+		Mode:          "allowlist",
+		AllowedEmails: []string{"@flatrun.dev", "@WhileSmart.dev"},
+	}
+	for _, email := range []string{"person@flatrun.dev", "admin@whilesmart.dev"} {
+		if !Allows(policy, email) {
+			t.Fatalf("domain member %q was rejected", email)
+		}
+	}
+	for _, email := range []string{"person@sub.flatrun.dev", "person@notflatrun.dev", "person@example.com"} {
+		if Allows(policy, email) {
+			t.Fatalf("non-member %q was accepted", email)
+		}
+	}
+	for _, entry := range []string{"@flatrun.dev", "@WhileSmart.dev", "person@example.com"} {
+		if !ValidAllowlistEntry(entry) {
+			t.Fatalf("allowlist entry %q was rejected", entry)
+		}
+	}
+	for _, entry := range []string{"@", "@flatrun.dev@example.com", "flatrun.dev"} {
+		if ValidAllowlistEntry(entry) {
+			t.Fatalf("invalid allowlist entry %q was accepted", entry)
+		}
+	}
+}
+
 func TestMatchingRouteOnlyAliasDoesNotModifyAliases(t *testing.T) {
 	aliases := make([]string, 1, 2)
 	aliases[0] = "www.example.com"
diff --git a/internal/api/access_handlers_test.go b/internal/api/access_handlers_test.go
index 1a3e72f..9b5274e 100644
--- a/internal/api/access_handlers_test.go
+++ b/internal/api/access_handlers_test.go
@@ -49,6 +49,7 @@ domains:
       mode: allowlist
       allowed_emails:
         - person@example.com
+        - "@flatrun.dev"
       email_target_id: smtp
 `
 	if err := os.WriteFile(filepath.Join(deploymentPath, "service.yml"), []byte(metadata), 0644); err != nil {
@@ -94,6 +95,17 @@ domains:
 		t.Fatalf("access link = %q, error = %v", link, err)
 	}
 	sender.message = ""
+	request = httptest.NewRequest(http.MethodPost, "/api/access/request", strings.NewReader(url.Values{
+		"email": {"visitor@flatrun.dev"}, "return": {"/"},
+	}.Encode()))
+	request.Host = "private.example.com"
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	response = httptest.NewRecorder()
+	router.ServeHTTP(response, request)
+	if response.Code != http.StatusAccepted || sender.recipient != "visitor@flatrun.dev" || sender.message == "" {
+		t.Fatalf("domain access request = %d, recipient = %q, message = %q", response.Code, sender.recipient, sender.message)
+	}
+	sender.message = ""
 	request = httptest.NewRequest(http.MethodPost, "/api/access/request", strings.NewReader(url.Values{
 		"email": {"other@example.com"}, "return": {"/"},
 	}.Encode()))
diff --git a/internal/api/deployment_actions.go b/internal/api/deployment_actions.go
index af5307b..e27a171 100644
--- a/internal/api/deployment_actions.go
+++ b/internal/api/deployment_actions.go
@@ -202,8 +202,8 @@ func (s *Server) validateDomainAccess(policy *models.DomainAccessConfig) error {
 		return apiErrf(http.StatusBadRequest, "At least one allowed email is required")
 	}
 	for _, email := range policy.AllowedEmails {
-		if !access.ValidEmail(email) {
-			return apiErrf(http.StatusBadRequest, "Allowed email %q is invalid", email)
+		if !access.ValidAllowlistEntry(email) {
+			return apiErrf(http.StatusBadRequest, "Allowed email or domain %q is invalid", email)
 		}
 	}
 	if policy.SessionHours < 0 || policy.SessionHours > 720 {