a mail sender can produce transmitter and send_email
#Example
```
//send with string
let rt = tokio::runtime::Runtime::new().unwrap();
rt.blockon(async {
//MailerSender params
//from:senderAccoun
//smtpsite:use which website to send email
//password:senderPassword(it can be origin password)
let mailer = MailerSender {
from: "sender@qq.com".tostring(),
password: "
```
#Example
```
//send with html
let rt = tokio::runtime::Runtime::new().unwrap();
rt.blockon(async {
let mailer = MailerSender {
from: "sender@qq.com".tostring(),
password: "hello,surprisess
".tostring(),
None,
None,
)
.await;
});
```
#Example
```
//send content and attachment
let rt = tokio::runtime::Runtime::new().unwrap();
rt.blockon(async {
let mailer = MailerSender {
from: "1984850802@qq.com".tostring(),
password: "sfckoixahcpodcbb".tostring(),
smtpsite: "smtp.qq.com".tostring(),
};
let _sendresult = MailerSender::sendemail(
&mailer,
"3502728398@qq.com".tostring(),
"邮件".tostring(),
"hello,surprise
".tostring(),
Some("1.pdf".tostring()),
Some("resume.pdf".tostring()),
)
.await;
});