diff --git a/plugins/base/handlers.go b/plugins/base/handlers.go
index d0ba9ba..133052c 100644
--- a/plugins/base/handlers.go
+++ b/plugins/base/handlers.go
@@ -23,6 +23,7 @@ type MailboxRenderData struct {
 	Mailboxes          []*imap.MailboxInfo
 	Messages           []imapMessage
 	PrevPage, NextPage int
+	Query              string
 }
 
 func handleGetMailbox(ectx echo.Context) error {
@@ -41,6 +42,8 @@ func handleGetMailbox(ectx echo.Context) error {
 		}
 	}
 
+	query := ctx.FormValue("query")
+
 	var mailboxes []*imap.MailboxInfo
 	var msgs []imapMessage
 	var mbox *imap.MailboxStatus
@@ -49,7 +52,12 @@ func handleGetMailbox(ectx echo.Context) error {
 		if mailboxes, err = listMailboxes(c); err != nil {
 			return err
 		}
-		if msgs, err = listMessages(c, mboxName, page); err != nil {
+		if query != "" {
+			msgs, err = searchMessages(c, mboxName, query)
+		} else {
+			msgs, err = listMessages(c, mboxName, page)
+		}
+		if err != nil {
 			return err
 		}
 		mbox = c.Mailbox()
@@ -60,11 +68,14 @@ func handleGetMailbox(ectx echo.Context) error {
 	}
 
 	prevPage, nextPage := -1, -1
-	if page > 0 {
-		prevPage = page - 1
-	}
-	if (page+1)*messagesPerPage < int(mbox.Messages) {
-		nextPage = page + 1
+	if query == "" {
+		// TODO: paging for search
+		if page > 0 {
+			prevPage = page - 1
+		}
+		if (page+1)*messagesPerPage < int(mbox.Messages) {
+			nextPage = page + 1
+		}
 	}
 
 	return ctx.Render(http.StatusOK, "mailbox.html", &MailboxRenderData{
@@ -74,6 +85,7 @@ func handleGetMailbox(ectx echo.Context) error {
 		Messages:   msgs,
 		PrevPage:   prevPage,
 		NextPage:   nextPage,
+		Query:      query,
 	})
 }
 
diff --git a/plugins/base/imap.go b/plugins/base/imap.go
index 93f3c4e..b1e36a6 100644
--- a/plugins/base/imap.go
+++ b/plugins/base/imap.go
@@ -189,7 +189,7 @@ func listMessages(conn *imapclient.Client, mboxName string, page int) ([]imapMes
 		return nil, nil
 	}
 
-	seqSet := new(imap.SeqSet)
+	var seqSet imap.SeqSet
 	seqSet.AddRange(uint32(from), uint32(to))
 
 	fetch := []imap.FetchItem{imap.FetchEnvelope, imap.FetchUid, imap.FetchBodyStructure}
@@ -197,7 +197,7 @@ func listMessages(conn *imapclient.Client, mboxName string, page int) ([]imapMes
 	ch := make(chan *imap.Message, 10)
 	done := make(chan error, 1)
 	go func() {
-		done <- conn.Fetch(seqSet, fetch, ch)
+		done <- conn.Fetch(&seqSet, fetch, ch)
 	}()
 
 	msgs := make([]imapMessage, 0, to-from)
@@ -218,6 +218,53 @@ func listMessages(conn *imapclient.Client, mboxName string, page int) ([]imapMes
 	return msgs, nil
 }
 
+func searchMessages(conn *imapclient.Client, mboxName, query string) ([]imapMessage, error) {
+	if err := ensureMailboxSelected(conn, mboxName); err != nil {
+		return nil, err
+	}
+
+	criteria := imap.SearchCriteria{Text: []string{query}}
+	nums, err := conn.Search(&criteria)
+	if err != nil {
+		return nil, fmt.Errorf("UID SEARCH failed: %v", err)
+	}
+	if len(nums) == 0 {
+		return nil, nil
+	}
+
+	indexes := make(map[uint32]int)
+	for i, num := range nums {
+		indexes[num] = i
+	}
+
+	// TODO: paging
+	var seqSet imap.SeqSet
+	seqSet.AddNum(nums...)
+
+	fetch := []imap.FetchItem{imap.FetchEnvelope, imap.FetchUid, imap.FetchBodyStructure}
+
+	ch := make(chan *imap.Message, 10)
+	done := make(chan error, 1)
+	go func() {
+		done <- conn.Fetch(&seqSet, fetch, ch)
+	}()
+
+	msgs := make([]imapMessage, len(nums))
+	for msg := range ch {
+		i, ok := indexes[msg.SeqNum]
+		if !ok {
+			continue
+		}
+		msgs[i] = imapMessage{msg}
+	}
+
+	if err := <-done; err != nil {
+		return nil, fmt.Errorf("failed to fetch message list: %v", err)
+	}
+
+	return msgs, nil
+}
+
 func getMessagePart(conn *imapclient.Client, mboxName string, uid uint32, partPath []int) (*imapMessage, *message.Entity, error) {
 	if err := ensureMailboxSelected(conn, mboxName); err != nil {
 		return nil, nil, err
diff --git a/plugins/base/plugin.go b/plugins/base/plugin.go
index 906730d..7c2aeaf 100644
--- a/plugins/base/plugin.go
+++ b/plugins/base/plugin.go
@@ -23,6 +23,7 @@ func init() {
 	})
 
 	p.GET("/mailbox/:mbox", handleGetMailbox)
+	p.POST("/mailbox/:mbox", handleGetMailbox)
 
 	p.GET("/message/:mbox/:uid", func(ectx echo.Context) error {
 		ctx := ectx.(*koushin.Context)
diff --git a/plugins/base/public/login.html b/plugins/base/public/login.html
index 8ce5f25..7378935 100644
--- a/plugins/base/public/login.html
+++ b/plugins/base/public/login.html
@@ -2,7 +2,7 @@
 
 <h1>koushin</h1>
 
-<form method="post" action="/login">
+<form method="post" action="">
 	<label for="username">Username:</label>
 	<input type="text" name="username" id="username"/>
 	<br><br>
diff --git a/plugins/base/public/mailbox.html b/plugins/base/public/mailbox.html
index ddd1260..53cf697 100644
--- a/plugins/base/public/mailbox.html
+++ b/plugins/base/public/mailbox.html
@@ -8,6 +8,11 @@
 
 <h2>{{.Mailbox.Name}}</h2>
 
+<form method="post" action="">
+	<input type="search" name="query" value="{{.Query}}">
+	<input type="submit" value="Search">
+</form>
+
 <p>Mailboxes:</p>
 <ul>
 	{{range .Mailboxes}}