diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3168871
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/taoshihan1991/imaptool
+
+go 1.14
+
+require github.com/emersion/go-imap v1.0.4
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..4959b4b
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/emersion/go-imap v1.0.4 h1:uiCAIHM6Z5Jwkma1zdNDWWXxSCqb+/xHBkHflD7XBro=
+github.com/emersion/go-imap v1.0.4/go.mod h1:yKASt+C3ZiDAiCSssxg9caIckWF/JG7ZQTO7GAmvicU=
+github.com/emersion/go-message v0.11.1/go.mod h1:C4jnca5HOTo4bGN9YdqNQM9sITuT3Y0K6bSUw9RklvY=
+github.com/emersion/go-sasl v0.0.0-20191210011802-430746ea8b9b h1:uhWtEWBHgop1rqEk2klKaxPAkVDCXexai6hSuRQ7Nvs=
+github.com/emersion/go-sasl v0.0.0-20191210011802-430746ea8b9b/go.mod h1:G/dpzLu16WtQpBfQ/z3LYiYJn3ZhKSGWn83fyoyQe/k=
+github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U=
+github.com/martinlindhe/base36 v1.0.0/go.mod h1:+AtEs8xrBpCeYgSLoY/aJ6Wf37jtBuR0s35750M27+8=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/imaptool.exe b/imaptool.exe
new file mode 100644
index 0000000..b2a924f
Binary files /dev/null and b/imaptool.exe differ
diff --git a/imaptool.go b/imaptool.go
index 2d231a7..d068e5a 100644
--- a/imaptool.go
+++ b/imaptool.go
@@ -1,11 +1,78 @@
 package main
 
 import (
-	"fmt"
+	"log"
 
-	"github.com/taoshihan1991/imaptool/tools"
+	"github.com/emersion/go-imap/client"
+	"github.com/emersion/go-imap"
 )
 
 func main() {
-	fmt.Printf(tools.Reverse("!taoshihan ,olleH"))
-}
+	log.Println("正在连接服务器...")
+
+	// 连接到服务器
+	c, err := client.DialTLS("imap.sina.net:993", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("连接成功")
+
+	// 不要忘了退出
+	defer c.Logout()
+
+	// 登陆
+	if err := c.Login("shihan2@appdev.sinanet.com", "tsh_xxx"); err != nil {
+		log.Fatal(err)
+	}
+	log.Println("成功登陆")
+
+	// 列邮箱
+	mailboxes := make(chan *imap.MailboxInfo, 10)
+	done := make(chan error, 1)
+	go func () {
+		done <- c.List("", "*", mailboxes)
+	}()
+
+	log.Println("邮箱:")
+	for m := range mailboxes {
+		log.Println("* " + m.Name)
+	}
+
+	if err := <-done; err != nil {
+		log.Fatal(err)
+	}
+
+	// Select INBOX
+	mbox, err := c.Select("INBOX", false)
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("INBOX的Flags标记:", mbox.Flags)
+
+	// 获取最新的 4 封信
+	from := uint32(1)
+	to := mbox.Messages
+	if mbox.Messages > 3 {
+		// 我们在这使用无符号整型, 这是再获取from的id
+		from = mbox.Messages - 3
+	}
+	seqset := new(imap.SeqSet)
+	seqset.AddRange(from, to)
+
+	messages := make(chan *imap.Message, 10)
+	done = make(chan error, 1)
+	go func() {
+		done <- c.Fetch(seqset, []imap.FetchItem{imap.FetchEnvelope}, messages)
+	}()
+
+	log.Println("最新的 4 封信:")
+	for msg := range messages {
+		log.Println("* " + msg.Envelope.Subject)
+	}
+
+	if err := <-done; err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println("结束!")
+}
\ No newline at end of file
diff --git a/tools/reverse_test.go b/tools/reverse_test.go
new file mode 100644
index 0000000..1d2703e
--- /dev/null
+++ b/tools/reverse_test.go
@@ -0,0 +1,19 @@
+package tools
+
+import "testing"
+
+func TestReverse(t *testing.T) {
+	cases := []struct {
+		in, want string
+	}{
+		{"Hello, world", "dlrow ,olleH"},
+		{"Hello, 世界", "界世 ,olleH"},
+		{"", ""},
+	}
+	for _, c := range cases {
+		got := Reverse(c.in)
+		if got != c.want {
+			t.Errorf("Reverse(%q) == %q, want %q", c.in, got, c.want)
+		}
+	}
+}