Configure email in user api

dendrite-config.yaml

@@ -367,6 +367,15 @@ user_api:
   # The default lifetime is 3600000ms (60 minutes).
   # openid_token_lifetime_ms: 3600000
 
+  # If following configuration is provided, HS will send verification emails on it's own.
+  email:
+    enabled: false
+    templates_path: res/default
+    smtp:
+      host: localhost:25
+      user: exampleusername
+      password: examplepassword
+
 # Configuration for Opentracing.
 # See https://github.com/matrix-org/dendrite/tree/master/docs/tracing for information on
 # how this works and how to set it up.

setup/config/config_userapi.go

@@ -19,6 +19,23 @@ type UserAPI struct {
 	// The Device database stores session information for the devices of logged
 	// in local users. It is accessed by the UserAPI.
 	DeviceDatabase DatabaseOptions `yaml:"device_database"`
+	// The Threepid database stores information for 3PID validation sessions.
+	// It is accessed by the UserAPI.
+	ThreepidDatabase DatabaseOptions `yaml:"threepid_database"`
+	Email            EmailConf       `yaml:"email"`
+}
+
+type EmailConf struct {
+	Enabled       bool   `yaml:"enabled"`
+	From          string `yaml:"from"`
+	TemplatesPath string `yaml:"templates_path"`
+	Smtp          Smtp   `yaml:"smtp"`
+}
+
+type Smtp struct {
+	Host     string `yaml:"host"`
+	User     string `yaml:"user"`
+	Password string `yaml:"password"`
 }
 
 const DefaultOpenIDTokenLifetimeMS = 3600000 // 60 minutes