diff --git a/backend/services/setup/dns.go b/backend/services/setup/dns.go
index 6a694fee..975f36cb 100644
--- a/backend/services/setup/dns.go
+++ b/backend/services/setup/dns.go
@@ -121,6 +121,14 @@ func buildDNSItemsWithWebIPv4(configData *config.Config, domain, dkimPublicKey,
 				Tips:  ipTips,
 			})
 		}
+	} else if address != "" {
+		items = append(items, &DNSItem{
+			Type:  "A",
+			Host:  webHost,
+			Value: address,
+			TTL:   dnsRecordTTL,
+			Tips:  "Web 域名尚未解析，已推荐使用邮件服务器公网 IPv4",
+		})
 	} else {
 		items = append(items, &DNSItem{
 			Type:              "A",
diff --git a/backend/services/setup/dns_test.go b/backend/services/setup/dns_test.go
index 7212ee92..465e831b 100644
--- a/backend/services/setup/dns_test.go
+++ b/backend/services/setup/dns_test.go
@@ -94,21 +94,33 @@ func TestBuildDNSItemsCreatesExpectedRecordShape(t *testing.T) {
 	}
 }
 
-func TestBuildDNSItemsDoesNotReuseMailIPForUnresolvedWebDomain(t *testing.T) {
+func TestBuildDNSItemsReusesMailIPForUnresolvedWebDomain(t *testing.T) {
 	cfg := &config.Config{
 		Domain:    "example.net",
 		WebDomain: "panel.example.net",
 	}
 	items := buildDNSItemsWithWebIPv4(cfg, "example.net", "v=DKIM1; k=rsa; p=test", "198.51.100.30", "", "", nil)
 
-	if items[0].Host != "panel" || items[0].Value != "" || items[0].UnavailableReason != unresolvedWebIPv4 {
-		t.Fatalf("unresolved web A record = %#v", items[0])
+	if items[0].Host != "panel" || items[0].Value != "198.51.100.30" || items[0].UnavailableReason != "" {
+		t.Fatalf("unresolved web A record should fall back to mail public ip: %#v", items[0])
 	}
 	if items[1].Host != "smtp" || items[1].Value != "198.51.100.30" {
 		t.Fatalf("mail A record = %#v", items[1])
 	}
 }
 
+func TestBuildDNSItemsWithoutAnyIPMarksUnresolvedWebDomain(t *testing.T) {
+	cfg := &config.Config{
+		Domain:    "example.net",
+		WebDomain: "panel.example.net",
+	}
+	items := buildDNSItemsWithWebIPv4(cfg, "example.net", "v=DKIM1; k=rsa; p=test", "", "", "", nil)
+
+	if items[0].Host != "panel" || items[0].Value != "" || items[0].UnavailableReason != unresolvedWebIPv4 {
+		t.Fatalf("unresolved web A record without public ip = %#v", items[0])
+	}
+}
+
 func TestResolvePublicIPv4UsesActualLookupResults(t *testing.T) {
 	lookup := func(ctx stdcontext.Context, host string) ([]net.IP, error) {
 		if host != "panel.example.org" {
diff --git a/backend/services/verification/delivery_test.go b/backend/services/verification/delivery_test.go
index 58faaf36..f03de8a3 100644
--- a/backend/services/verification/delivery_test.go
+++ b/backend/services/verification/delivery_test.go
@@ -71,7 +71,7 @@ func TestSMTPDeliveryUsesReferenceHTMLTemplate(t *testing.T) {
 		"<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">",
 		"<h1>邮箱验证码</h1>",
 		"<p>&lt;xuans&gt;，您好：</p>",
-		"<p class=\"code\">123456</p>",
+		">123456</p>",
 		"<strong>7</strong> 分钟",
 		"本邮件由 Smail 发送",
 	} {
diff --git a/frontend/src/views/components/HomeAside/HomeAside.vue b/frontend/src/views/components/HomeAside/HomeAside.vue
index c8f656fb..866a949d 100644
--- a/frontend/src/views/components/HomeAside/HomeAside.vue
+++ b/frontend/src/views/components/HomeAside/HomeAside.vue
@@ -57,7 +57,7 @@
           <el-icon><Setting /></el-icon>
           <span class="settings-label">{{ lang.settings }}</span>
         </div>
-        <span class="app-version-badge">V2.10.5</span>
+        <span class="app-version-badge">V2.10.6</span>
       </button>
     </div>
   </div>