GoSendMail:简单的smtp sendmail工具

发送邮件 GoSendMail 是简单的 smtp 发件人。 仅编码 utf8。 使用示例： // smtpServer info : IP Address, port, userName, Password smtpServer := gosendmail.NewSmtpSever("xxx.xxx.xxx.xxx", 25, "yyy", "zzz") // sendmail info : from address, to address, cc address, subject, body sendMail := gosendmail.NewSendMail("abc@xxx.xxx", []string{"abc@xxx.xxx"}, []string{"xyz@gxxx.xxx"}, "UTF8のSubject", "UTF8の本文") // send smtp mai