feat: development compose file;

fix: smtp service

backend/internal/services/smtp.go

@@ -72,7 +72,7 @@ func (s *smtpServiceImpl) SendEmail(to string, subject, body string) error {
 	sb.WriteString("\r\n" + body)
 	message := []byte(sb.String())
 
-	hostPort := fmt.Sprintf("%s:%d", cfg.SmtpServer, cfg.SmtpPort)
+	hostPort := net.JoinHostPort(cfg.SmtpServer, fmt.Sprintf("%d", cfg.SmtpPort))
 	var conn net.Conn
 	var err error
 
@@ -117,8 +117,8 @@ func (s *smtpServiceImpl) SendEmail(to string, subject, body string) error {
 		return err
 	}
 
-	for _, recipient := range to {
-		if err = client.Rcpt(string(recipient)); err != nil {
+	for _, recipient := range toSlice {
+		if err = client.Rcpt(recipient); err != nil {
 			s.log.Error("SMTP recipient set failed", zap.Error(err))
 			return err
 		}