我正在尝试向多个收件人发送电子邮件。为此，我创建了一个收件人数组，但是使用我的代码，我只能将邮件发送到阵列的最后一次电子邮件ID三次。我的代码出了什么问题？
var nodemailer = require("nodemailer");
var smtpTransport = nodemailer.createTransport(
"SMTP",{
host: '',
// secureConnection: true, // use SSL
port: 25
});
var maillist = [
'****.sharma3@****.com',
'****.bussa@****.com',
'****.gawri@****.com',
];
var msg = {
from: "******", // sender address
subject: "Hello ✔", // Subject line
text: "Hello This is an auto generated Email for testing from node please ignore it ✔", // plaintext body
cc: "*******"
// html: "<b>Hello world ✔</b>" // html body
}
maillist.forEach(function (to, i , array) {
msg.to = to;
smtpTransport.sendMail(msg, function (err) {
if (err) {
console.log('Sending to ' + to + ' failed: ' + err);
return;
} else {
console.log('Sent to ' + to);
}
if (i === maillist.length - 1) { msg.transport.close(); }
});
});
答案 0 :(得分：28)
nodemailer（v2.4.2）docs说：
to- 逗号分隔列表或收件人电子邮件地址数组，将显示在收件人：字段
所以你可以这样做：
var maillist = [
'****.sharma3@****.com',
'****.bussa@****.com',
'****.gawri@****.com',
];
var msg = {
from: "******", // sender address
subject: "Hello ✔", // Subject line
text: "Hello This is an auto generated Email for testing from node please ignore it ✔", // plaintext body
cc: "*******",
to: maillist
}
答案 1 :(得分：21)
据我所知，您将能够获得这样的多个收件人
"mail1@mail.com,mail2@mail.com,mail3@mail.com,mail4@mail.com"
那你为什么不做
这样的事情var maillist = '****.sharma3@****.com, ****.bussa@****.com, ****.gawri@****.com';
var msg = {
from: "******", // sender address
to: maillist,
subject: "Hello ✔", // Subject line
text: "Hello This is an auto generated Email for ... ✔", // plaintext body
cc: "*******"
// html: "<b>Hello world ✔</b>" // html body
}
我已经尝试过并且正在运作。此外，从我的角度来看，为什么你不得不担心＆＃34;异步＆＃34;如果您有发送的能力，可以发送1K次电子邮件 所有这些都只有一次没有任何并发症？
无论如何希望得到这个帮助，回答你的问题或者它可能对其他人有帮助
当然，我的答案可以改善......
答案 2 :(得分：8)
您的问题是从异步代码引用相同的msg对象。 forema在sendMail发送电子邮件之前完成。
所以msg.to将成为maiilist对象的最后一项。
尝试在maillist foreach中克隆/复制msg，或者只是将msg定义移到那里：
maillist.forEach(function (to, i , array) {
var msg = {
from: "******", // sender address
subject: "Hello ✔", // Subject line
text: "Hello This is an auto generated Email for testing from node please ignore it ✔", // plaintext body
cc: "*******"
// html: "<b>Hello world ✔</b>" // html body
}
msg.to = to;
smtpTransport.sendMail(msg, function (err) {
答案 3 :(得分：4)
var maillist = [
'****.sharma3@****.com',
'****.bussa@****.com',
'****.gawri@****.com',
];
maillist.toString();
var msg = {
from: "******", // sender address
to: maillist,
subject: "Hello ✔", // Subject line
text: "Hello This is an auto generated Email for testing from node please ignore it ✔", // plaintext body
cc: "*******"
// html: "<b>Hello world ✔</b>" // html body
}
答案 4 :(得分：4)
异步执行此操作的一种好方法是使用异步模块中的每个函数：https://caolan.github.io/async/docs.html#each
var async = require("async");
async.each(maillist, function(to, callback){
msg.to = to;
smtpTransport.sendMail(msg, function (err) {
if (err) {
console.log('Sending to ' + to + ' failed: ' + err);
callback(err);
} else {
console.log('Sent to ' + to);
callback();
}
});
}, function(err){
if(err){
console.log("Sending to all emails failed:" + err);
}
//Do other stuff or return appropriate value here
});
答案 5 :(得分：3)
let info = await transporter.sendMail({
from: [{ name: "sender Name", address: "sender@example.com" }], // sender address
to: [
{ name: "Receiver Name 1", address: "receiver1@example.com" },
{ name: "Receiver Name 2", address: "receiver2@example.com" },
],
subject: "Hey you, awesome!",
html: "<b>This is bold text</b>",
text: "This is text version!",
});
答案 6 :(得分：1)
在forEach循环完成之后，sendMail方法实际上已得到解决，但是问题是sendMail方法没有返回诺言类型，因此，如果尝试等待它，它将仍然无法工作。
所以您需要做的是为sendmail创建一个单独的功能，因此可以像这样做出承诺
const send = (transporter: any, mailOptions: any) => {
return new Promise((resolve, reject) => {
transporter.sendMail(mailOptions, (error: any, info: any) => {
if (error) {
return reject(error);
} else {
return resolve();
}
});
});
};
因此可以等待，因此迭代器将等待过程完成，然后再进入下一个循环。
完整的代码应如下所示
let transporter = nodemailer.createTransport({
host: "mail.smtp.com", // your server host address
port: 587, // port
secure: false, // use TLS // true for 465, false for other ports
auth: {
user: EMAIL_USER, // your email address
pass: EMAIL_PSW, // your password
},
tls: {
rejectUnauthorized: false
}
});
// store an array of errors if any
let successful: any[] = [];
let failed: any[] = [];
await recipients.forEach(async (to, i) => {
let mailOptions = {
from, // sender address
to, // list of receivers
subject, // Subject line
text // plain text body
};
if (html) {
(mailOptions as any).html = html;
}
// send mail with defined transport object
// here we use the fuction we created which is now a promise
await send(transporter, mailOptions)
.then(() => {
successful.push({ success: true, to });
})
.catch(reason => {
failed.push({ success: false, to, message: reason });
});
if (i === recipients.length - 1) {
if (failed.length === recipients.length) {
return reject({ failed });
} else {
return resolve({ successful, failed });
}
}
});
});
const send = (transporter: any, mailOptions: any) => {
return new Promise((resolve, reject) => {
transporter.sendMail(mailOptions, (error: any, info: any) => {
if (error) {
return reject(error);
} else {
return resolve();
}
});
});
};
答案 7 :(得分：0)
您正在异步发送电子邮件，因此您需要一个等待所有邮件的等待函数，直到它们被发送为止，因为如果没有，您编程退出并且某些请求未得到满足。因此，您必须执行一种超时功能，以检查是否已发送电子邮件。
答案 8 :(得分：0)
maillist.forEach(function (to, i , array) {
(function(i,to){
msg.to = to;
smtpTransport.sendMail(msg, function (err) {
if (err) {
console.log('Sending to ' + to + ' failed: ' + err);
return;
} else {
console.log('Sent to ' + to);
}
if (i === maillist.length - 1) { msg.transport.close(); }
});
})(i,to)
});