send-mail refactor (#7885)

utils/mail.go

@@ -103,10 +103,6 @@ func TestConnection(config *model.Config) {
 	defer c.Close()
 }
 
-func SendMail(to, subject, htmlBody string) *model.AppError {
-	return SendMailUsingConfig(to, subject, htmlBody, Cfg)
-}
-
 func SendMailUsingConfig(to, subject, htmlBody string, config *model.Config) *model.AppError {
 	if !config.EmailSettings.SendEmailNotifications || len(config.EmailSettings.SMTPServer) == 0 {
 		return nil