diff --git a/handlers.go b/handlers.go
index 4919d33..f53085c 100644
--- a/handlers.go
+++ b/handlers.go
@@ -82,7 +82,7 @@ func handleLogin(ectx echo.Context) error {
 	username := ctx.FormValue("username")
 	password := ctx.FormValue("password")
 	if username != "" && password != "" {
-		s, err := ctx.Server.sessions.Put(username, password)
+		s, err := ctx.Server.Sessions.Put(username, password)
 		if err != nil {
 			if _, ok := err.(AuthError); ok {
 				return ctx.Render(http.StatusOK, "login.html", nil)
diff --git a/server.go b/server.go
index f4b6e48..44392a0 100644
--- a/server.go
+++ b/server.go
@@ -15,7 +15,8 @@ const cookieName = "koushin_session"
 const messagesPerPage = 50
 
 type Server struct {
-	sessions *SessionManager
+	Sessions *SessionManager
+	Plugins []Plugin
 
 	imap struct {
 		host     string
@@ -28,8 +29,6 @@ type Server struct {
 		tls      bool
 		insecure bool
 	}
-
-	plugins []Plugin
 }
 
 func (s *Server) parseIMAPURL(imapURL string) error {
@@ -76,7 +75,7 @@ func (s *Server) parseSMTPURL(smtpURL string) error {
 
 func newServer(imapURL, smtpURL string) (*Server, error) {
 	s := &Server{}
-	s.sessions = newSessionManager(s.connectIMAP)
+	s.Sessions = newSessionManager(s.connectIMAP)
 
 	if err := s.parseIMAPURL(imapURL); err != nil {
 		return nil, err
@@ -134,12 +133,12 @@ func New(e *echo.Echo, options *Options) error {
 		return err
 	}
 
-	s.plugins, err = loadAllLuaPlugins(e.Logger)
+	s.Plugins, err = loadAllLuaPlugins(e.Logger)
 	if err != nil {
 		return fmt.Errorf("failed to load plugins: %v", err)
 	}
 
-	e.Renderer, err = loadTemplates(e.Logger, options.Theme, s.plugins)
+	e.Renderer, err = loadTemplates(e.Logger, options.Theme, s.Plugins)
 	if err != nil {
 		return fmt.Errorf("failed to load templates: %v", err)
 	}
@@ -172,14 +171,14 @@ func New(e *echo.Echo, options *Options) error {
 				return err
 			}
 
-			ctx.Session, err = ctx.Server.sessions.Get(cookie.Value)
+			ctx.Session, err = ctx.Server.Sessions.get(cookie.Value)
 			if err == ErrSessionExpired {
 				ctx.SetSession(nil)
 				return ctx.Redirect(http.StatusFound, "/login")
 			} else if err != nil {
 				return err
 			}
-			ctx.Session.Ping()
+			ctx.Session.ping()
 
 			return next(ctx)
 		}
@@ -210,7 +209,7 @@ func New(e *echo.Echo, options *Options) error {
 	e.Static("/assets", "public/assets")
 	e.Static("/themes", "public/themes")
 
-	for _, p := range s.plugins {
+	for _, p := range s.Plugins {
 		p.SetRoutes(e.Group(""))
 	}
 
diff --git a/session.go b/session.go
index 63ba997..e4e2eb0 100644
--- a/session.go
+++ b/session.go
@@ -45,7 +45,7 @@ type Session struct {
 	imapConn *imapclient.Client // protected by locker, can be nil
 }
 
-func (s *Session) Ping() {
+func (s *Session) ping() {
 	s.pings <- struct{}{}
 }
 
@@ -102,7 +102,7 @@ func (sm *SessionManager) connect(username, password string) (*imapclient.Client
 	return c, nil
 }
 
-func (sm *SessionManager) Get(token string) (*Session, error) {
+func (sm *SessionManager) get(token string) (*Session, error) {
 	sm.locker.Lock()
 	defer sm.locker.Unlock()
 
diff --git a/template.go b/template.go
index 1c38c07..7f4d658 100644
--- a/template.go
+++ b/template.go
@@ -55,7 +55,7 @@ func (r *renderer) Render(w io.Writer, name string, data interface{}, ectx echo.
 	// ectx is the raw *echo.context, not our own *Context
 	ctx := ectx.Get("context").(*Context)
 
-	for _, plugin := range ctx.Server.plugins {
+	for _, plugin := range ctx.Server.Plugins {
 		if err := plugin.Inject(name, data); err != nil {
 			return fmt.Errorf("failed to run plugin '%v': %v", plugin.Name(), err)
 		}