#49 added smtpHost to add extra smtp host after resolveMX

Readme.md

@@ -38,9 +38,10 @@ const sendmail = require('sendmail')({
     privateKey: fs.readFileSync('./dkim-private.pem', 'utf8'),
     keySelector: 'mydomainkey'
   },
-  devPort: 1025 // Default: False
-  devHost: 'localhost' // Default: localhost
-  smtpPort: 2525 // Default: 25
+  devPort: 1025, // Default: False
+  devHost: 'localhost', // Default: localhost
+  smtpPort: 2525, // Default: 25
+  smtpHost: 'localhost' // Default: -1 - extra smtp host after resolveMX
 })
 ```
 
@@ -68,6 +69,7 @@ Please checkout our great examples
 - **[meetingRequest.js](https://github.com/guileen/node-sendmail/blob/master/examples/meetingRequest.js)**
 - **[simple.js](https://github.com/guileen/node-sendmail/blob/master/examples/simple.js)**
 - **[devHostPort.js](https://github.com/guileen/node-sendmail/blob/master/examples/devHostPort.js)**
+- **[smtpPort.js](https://github.com/guileen/node-sendmail/blob/master/examples/smtpPort.js)**
 
 ### Upgrading
 
@@ -140,8 +142,16 @@ Add option to override "localhost" when sending all SMTP traffic to a dummy serv
 ##### 1.3.0
 Add option to override "smtpPort:25" 
 
+##### 1.4.0
+Add option to add extra smtp host after resolveMX "smtpHost:-1"
+Added Yarn Lock
 
 ### Roadmap
 
 * Add Testing
+* Add Better Error Handling
+* Add A Retry feature
+* Update how we do options
+* Respond with documented status codes
+* CRLF
 * Please submit your ideas as PR's

examples/smtpPort.js

@@ -0,0 +1,15 @@
+var sendmail = require('../sendmail')({
+    smtpHost:'localhost',
+    smtpPort: 1025
+})
+
+sendmail({
+  from: 'test@yourdomain.com',
+  to: 'info@yourdomain.com',
+  replyTo: 'jason@yourdomain.com',
+  subject: 'MailComposer sendmail',
+  html: 'Mail of test sendmail '
+}, function (err, reply) {
+  console.log(err && err.stack)
+  console.dir(reply)
+})

package.json

@@ -2,7 +2,7 @@
   "author": "Gui Lin <guileen@gmail.com>",
   "name": "sendmail",
   "description": "Sendmail without setting up SMTP server",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "repository": {
     "type": "git",
     "url": "git://github.com/guileen/node-sendmail.git"

sendmail.js

@@ -22,7 +22,7 @@ module.exports = function (options) {
   const devPort = options.devPort || -1;
   const devHost = options.devHost || 'localhost';
   const smtpPort = options.smtpPort || 25
-
+  const smtpHost = options.smtpHost || -1
   /*
    *   邮件服务返回代码含义 Mail service return code Meaning
    *   500   格式错误，命令不可识别（此错误也包括命令行过长）format error, command unrecognized (This error also includes command line too long)
@@ -83,7 +83,7 @@ module.exports = function (options) {
         if (!data || data.length === 0) {
           return callback(new Error('can not resolve Mx of <' + domain + '>'))
         }
-
+        if(smtpHost !== -1)data.push({exchange:smtpHost})
         function tryConnect (i) {
           if (i >= data.length) return callback(new Error('can not connect to any SMTP server'));