Add Exchange SMTP Oauth2 Support (not verified)

Signed-off-by: Asai Neko <sugar@sne.moe>

config/types.go

@@ -40,14 +40,23 @@ type search struct {
 	ApiKey string `yaml:"api_key"`
 }
 
+type _email_oauth2 struct {
+	Tenantid     string `yaml:"tenant_id"`
+	ClientId     string `yaml:"client_id"`
+	ClientSecret string `yaml:"client_secret"`
+	Scope        string `yaml:"scope"`
+}
+
 type email struct {
-	Host               string `yaml:"host"`
-	Port               string `yaml:"port"`
-	Username           string `yaml:"username"`
-	Password           string `yaml:"password"`
-	Security           string `yaml:"security"`
-	InsecureSkipVerify bool   `yaml:"insecure_skip_verify"`
-	From               string `yaml:"from"`
+	Host               string        `yaml:"host"`
+	Port               string        `yaml:"port"`
+	Username           string        `yaml:"username"`
+	Password           string        `yaml:"password"`
+	Security           string        `yaml:"security"`
+	InsecureSkipVerify bool          `yaml:"insecure_skip_verify"`
+	From               string        `yaml:"from"`
+	Auth               string        `yaml:"auth"`
+	Oauth2             _email_oauth2 `yaml:"oauth2"`
 }
 
 type secrets struct {