feat(provider): allow optional username and password in email notifier

internal/tools/smtp/client.go

@@ -63,9 +63,6 @@ func (c *Client) Send(ctx context.Context, msg *Message) error {
 
 func createSmtpClient(config *Config) (*mail.Client, error) {
 	clientOptions := []mail.Option{
-		mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover),
-		mail.WithUsername(config.Username),
-		mail.WithPassword(config.Password),
 		mail.WithTimeout(time.Second * 30),
 	}
 
@@ -87,13 +84,23 @@ func createSmtpClient(config *Config) (*mail.Client, error) {
 			tlsConfig.ServerName = config.Host
 		}
 
-		clientOptions = append(clientOptions, mail.WithSSL())
-		clientOptions = append(clientOptions, mail.WithTLSConfig(tlsConfig))
-		clientOptions = append(clientOptions, mail.WithTLSPolicy(mail.TLSMandatory))
+		clientOptions = append(clientOptions,
+			mail.WithSSL(),
+			mail.WithTLSConfig(tlsConfig),
+			mail.WithTLSPolicy(mail.TLSMandatory),
+		)
 	} else {
 		clientOptions = append(clientOptions, mail.WithTLSPolicy(mail.TLSOpportunistic))
 	}
 
+	if config.Username != "" || config.Password != "" {
+		clientOptions = append(clientOptions,
+			mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover),
+			mail.WithUsername(config.Username),
+			mail.WithPassword(config.Password),
+		)
+	}
+
 	client, err := mail.NewClient(config.Host, clientOptions...)
 	if err != nil {
 		return nil, err

pkg/core/notifier/providers/email/email.go

@@ -20,9 +20,9 @@ type NotifierConfig struct {
 	// 是否启用 TLS。
 	SmtpTls bool `json:"smtpTls"`
 	// 用户名。
-	Username string `json:"username"`
+	Username string `json:"username,omitempty"`
 	// 密码。
-	Password string `json:"password"`
+	Password string `json:"password,omitempty"`
 	// 发件人邮箱。
 	SenderAddress string `json:"senderAddress"`
 	// 发件人显示名称。

ui/src/components/access/forms/AccessConfigFieldsProviderEmail.tsx

@@ -130,8 +130,8 @@ const getSchema = ({ i18n = getI18n() }: { i18n: ReturnType<typeof getI18n> }) =
     smtpHost: z.string().refine((v) => isHostname(v), t("common.errmsg.host_invalid")),
     smtpPort: z.coerce.number().refine((v) => isPortNumber(v), t("common.errmsg.port_invalid")),
     smtpTls: z.boolean().nullish(),
-    username: z.string().nonempty(),
-    password: z.string().nonempty(),
+    username: z.string().nullish(),
+    password: z.string().nullish(),
     senderAddress: z.email(),
     senderName: z.string().nullish(),
     receiverAddress: z.email().or(z.literal("")).nullish(),

ui/src/i18n/resources/en/nls.access.json

@@ -529,12 +529,12 @@
       }
     },
     "email_username": {
-      "label": "Username",
-      "placeholder": "please enter username"
+      "label": "Username (Optional)",
+      "placeholder": "please enter SMTP username"
     },
     "email_password": {
-      "label": "Password",
-      "placeholder": "please enter password"
+      "label": "Password (Optional)",
+      "placeholder": "please enter SMTP password"
     },
     "email_sender_address": {
       "label": "Sender email address",

ui/src/i18n/resources/zh/nls.access.json

@@ -527,12 +527,12 @@
       }
     },
     "email_username": {
-      "label": "用户名",
-      "placeholder": "请输入用户名"
+      "label": "用户名（可选）",
+      "placeholder": "请输入 SMTP 用户名"
     },
     "email_password": {
-      "label": "密码",
-      "placeholder": "请输入密码"
+      "label": "密码（可选）",
+      "placeholder": "请输入 SMTP 密码"
     },
     "email_sender_address": {
       "label": "发件人邮箱",