diff --git a/common/email.go b/common/email.go
index 1f0ad7e..7e15409 100644
--- a/common/email.go
+++ b/common/email.go
@@ -1,14 +1,20 @@
 package common
 
-import "gopkg.in/gomail.v2"
+import (
+	"fmt"
+	"net/smtp"
+	"strings"
+)
 
 func SendEmail(subject string, receiver string, content string) error {
-	m := gomail.NewMessage()
-	m.SetHeader("From", SMTPAccount)
-	m.SetHeader("To", receiver)
-	m.SetHeader("Subject", subject)
-	m.SetBody("text/html", content)
-	d := gomail.NewDialer(SMTPServer, SMTPPort, SMTPAccount, SMTPToken)
-	err := d.DialAndSend(m)
+	mail := []byte(fmt.Sprintf("To: %s\r\n"+
+		"From: %s<%s>\r\n"+
+		"Subject: %s\r\n"+
+		"Content-Type: text/html; charset=UTF-8\r\n\r\n%s\r\n",
+		receiver, SystemName, SMTPAccount, subject, content))
+	auth := smtp.PlainAuth("", SMTPAccount, SMTPToken, SMTPServer)
+	addr := fmt.Sprintf("%s:%d", SMTPServer, SMTPPort)
+	to := strings.Split(receiver, ";")
+	err := smtp.SendMail(addr, auth, SMTPAccount, to, mail)
 	return err
 }
diff --git a/go.mod b/go.mod
index a9cd7c2..fe5e30e 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,6 @@ require (
 	github.com/go-redis/redis/v8 v8.11.5
 	github.com/google/uuid v1.3.0
 	golang.org/x/crypto v0.5.0
-	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 	gorm.io/driver/mysql v1.4.3
 	gorm.io/driver/sqlite v1.4.3
 	gorm.io/gorm v1.24.0
@@ -51,6 +50,5 @@ require (
 	golang.org/x/sys v0.5.0 // indirect
 	golang.org/x/text v0.7.0 // indirect
 	google.golang.org/protobuf v1.28.1 // indirect
-	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 741d308..fa0c70e 100644
--- a/go.sum
+++ b/go.sum
@@ -159,15 +159,11 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
 google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
-gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
-gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df h1:n7WqCuqOuCbNr617RXOY0AWRXxgwEyPp2z+p0+hgMuE=
-gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkpBDuZnXENFzX8qRjMDMyPD6BRkCw=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=