diff --git a/README.ja.md b/README.ja.md
index 1f24a11dc9..2e27d1463f 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -374,7 +374,7 @@ notifyUsers  = ["@username"]
 
 [mail]
 smtpAddr      = "smtp.gmail.com"
-smtpPort      = "465"
+smtpPort      = "587"
 user          = "username"
 password      = "password"
 from          = "from@address.com"
@@ -455,7 +455,7 @@ host         = "172.31.4.82"
     ```
     [mail]
     smtpAddr      = "smtp.gmail.com"
-    smtpPort      = "465"
+    smtpPort      = "587"
     user          = "username"
     password      = "password"
     from          = "from@address.com"
diff --git a/README.md b/README.md
index d1e5819cdc..1140e04bae 100644
--- a/README.md
+++ b/README.md
@@ -373,7 +373,7 @@ notifyUsers  = ["@username"]
 
 [mail]
 smtpAddr      = "smtp.gmail.com"
-smtpPort      = "465"
+smtpPort      = "587"
 user          = "username"
 password      = "password"
 from          = "from@address.com"
@@ -457,7 +457,7 @@ You can customize your configuration using this template.
     ```
     [mail]
     smtpAddr      = "smtp.gmail.com"
-    smtpPort      = "465"
+    smtpPort      = "587"
     user          = "username"
     password      = "password"
     from          = "from@address.com"
diff --git a/commands/discover.go b/commands/discover.go
index 9e66c55ebc..92d147cd67 100644
--- a/commands/discover.go
+++ b/commands/discover.go
@@ -100,7 +100,7 @@ notifyUsers  = ["@username"]
 
 [mail]
 smtpAddr      = "smtp.gmail.com"
-smtpPort      = "465"
+smtpPort      = "587"
 user          = "username"
 password      = "password"
 from          = "from@address.com"
diff --git a/glide.lock b/glide.lock
index 442bbc2b35..022ec975d9 100644
--- a/glide.lock
+++ b/glide.lock
@@ -118,6 +118,4 @@ imports:
   - unix
 - name: gopkg.in/alexcesaro/quotedprintable.v3
   version: 2caba252f4dc53eaf6b553000885530023f54623
-- name: gopkg.in/gomail.v2
-  version: 81ebce5c23dfd25c6c67194b37d3dd3f338c98b1
 devImports: []
diff --git a/glide.yaml b/glide.yaml
index 015240a5dd..afc3e18e9c 100644
--- a/glide.yaml
+++ b/glide.yaml
@@ -35,4 +35,3 @@ import:
 - package: golang.org/x/net
   subpackages:
   - context
-- package: gopkg.in/gomail.v2
diff --git a/report/mail.go b/report/mail.go
index 34cd3febde..caa92adc39 100644
--- a/report/mail.go
+++ b/report/mail.go
@@ -18,13 +18,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package report
 
 import (
-	"crypto/tls"
 	"fmt"
-	"strconv"
+	"net"
+	"net/mail"
+	"net/smtp"
+	"strings"
 
 	"github.com/future-architect/vuls/config"
 	"github.com/future-architect/vuls/models"
-	"gopkg.in/gomail.v2"
 )
 
 // MailWriter send mail
@@ -33,37 +34,53 @@ type MailWriter struct{}
 func (w MailWriter) Write(scanResults []models.ScanResult) (err error) {
 	conf := config.Conf
 	for _, s := range scanResults {
-		m := gomail.NewMessage()
-		m.SetHeader("From", conf.Mail.From)
-		m.SetHeader("To", conf.Mail.To...)
-		m.SetHeader("Cc", conf.Mail.Cc...)
+		to := strings.Join(conf.Mail.To[:], ", ")
+		cc := strings.Join(conf.Mail.Cc[:], ", ")
+		mailAddresses := append(conf.Mail.To, conf.Mail.Cc...)
+		if _, err := mail.ParseAddressList(strings.Join(mailAddresses[:], ", ")); err != nil {
+			return fmt.Errorf("Failed to parse mail addresses: %s", err)
+		}
 
 		subject := fmt.Sprintf("%s%s %s",
 			conf.Mail.SubjectPrefix,
 			s.ServerInfo(),
 			s.CveSummary(),
 		)
-		m.SetHeader("Subject", subject)
+
+		headers := make(map[string]string)
+		headers["From"] = conf.Mail.From
+		headers["To"] = to
+		headers["Cc"] = cc
+		headers["Subject"] = subject
+
+		var message string
+		for k, v := range headers {
+			message += fmt.Sprintf("%s: %s\r\n", k, v)
+		}
 
 		var body string
 		if body, err = toPlainText(s); err != nil {
 			return err
 		}
-		m.SetBody("text/plain", body)
-		port, _ := strconv.Atoi(conf.Mail.SMTPPort)
-		d := gomail.NewPlainDialer(
-			conf.Mail.SMTPAddr,
-			port,
-			conf.Mail.User,
-			conf.Mail.Password,
-		)
+		message += "\r\n" + body
 
-		d.TLSConfig = &tls.Config{
-			InsecureSkipVerify: true,
-		}
+		smtpServer := net.JoinHostPort(conf.Mail.SMTPAddr, conf.Mail.SMTPPort)
+
+		err := smtp.SendMail(
+			smtpServer,
+			smtp.PlainAuth(
+				"",
+				conf.Mail.User,
+				conf.Mail.Password,
+				conf.Mail.SMTPAddr,
+			),
+			conf.Mail.From,
+			conf.Mail.To,
+			[]byte(message),
+		)
 
-		if err := d.DialAndSend(m); err != nil {
-			panic(err)
+		if err != nil {
+			return fmt.Errorf("Failed to send mails: %s", err)
 		}
 	}
 	return nil