diff --git a/conn_pool.go b/conn_pool.go
index ad6b736..fb530b9 100644
--- a/conn_pool.go
+++ b/conn_pool.go
@@ -23,7 +23,7 @@ var ErrSessionExpired = errors.New("session expired")
 // TODO: expiration timer
 type ConnPool struct {
 	locker sync.Mutex
-	conns map[string]*imapclient.Client
+	conns  map[string]*imapclient.Client
 }
 
 func NewConnPool() *ConnPool {
diff --git a/imap.go b/imap.go
index 3da0447..93eede3 100644
--- a/imap.go
+++ b/imap.go
@@ -9,9 +9,9 @@ import (
 	"strings"
 
 	"github.com/emersion/go-imap"
+	imapclient "github.com/emersion/go-imap/client"
 	"github.com/emersion/go-message"
 	"github.com/emersion/go-message/textproto"
-	imapclient "github.com/emersion/go-imap/client"
 )
 
 func (s *Server) connectIMAP() (*imapclient.Client, error) {
@@ -41,7 +41,7 @@ func (s *Server) connectIMAP() (*imapclient.Client, error) {
 func listMailboxes(conn *imapclient.Client) ([]*imap.MailboxInfo, error) {
 	ch := make(chan *imap.MailboxInfo, 10)
 	done := make(chan error, 1)
-	go func () {
+	go func() {
 		done <- conn.List("", "*", ch)
 	}()
 
@@ -171,8 +171,8 @@ func listMessages(conn *imapclient.Client, mboxName string) ([]imapMessage, erro
 	}
 
 	// Reverse list of messages
-	for i := len(msgs)/2-1; i >= 0; i-- {
-		opp := len(msgs)-1-i
+	for i := len(msgs)/2 - 1; i >= 0; i-- {
+		opp := len(msgs) - 1 - i
 		msgs[i], msgs[opp] = msgs[opp], msgs[i]
 	}
 
diff --git a/server.go b/server.go
index 86a1963..b252076 100644
--- a/server.go
+++ b/server.go
@@ -8,16 +8,16 @@ import (
 	"strings"
 	"time"
 
-	"github.com/labstack/echo/v4"
 	imapclient "github.com/emersion/go-imap/client"
+	"github.com/labstack/echo/v4"
 )
 
 const cookieName = "koushin_session"
 
 type Server struct {
 	imap struct {
-		host string
-		tls bool
+		host     string
+		tls      bool
 		insecure bool
 
 		pool *ConnPool
@@ -51,15 +51,15 @@ func NewServer(imapURL string) (*Server, error) {
 type context struct {
 	echo.Context
 	server *Server
-	conn *imapclient.Client
+	conn   *imapclient.Client
 }
 
 var aLongTimeAgo = time.Unix(233431200, 0)
 
 func (c *context) setToken(token string) {
 	cookie := http.Cookie{
-		Name: cookieName,
-		Value: token,
+		Name:     cookieName,
+		Value:    token,
 		HttpOnly: true,
 		// TODO: domain, secure
 	}
@@ -179,9 +179,9 @@ func New(imapURL string) *echo.Echo {
 		}
 
 		return ctx.Render(http.StatusOK, "mailbox.html", map[string]interface{}{
-			"Mailbox": ctx.conn.Mailbox(),
+			"Mailbox":   ctx.conn.Mailbox(),
 			"Mailboxes": mailboxes,
-			"Messages": msgs,
+			"Messages":  msgs,
 		})
 	})
 
@@ -206,7 +206,7 @@ func New(imapURL string) *echo.Echo {
 		return ctx.Render(http.StatusOK, "message.html", map[string]interface{}{
 			"Mailbox": ctx.conn.Mailbox(),
 			"Message": msg,
-			"Body": body,
+			"Body":    body,
 		})
 	})