Support 'alias' in mail transport config.

Useful if you need to set up multiple transports of the same type.

[forward-port of strongloop#2489]

lib/connectors/mail.js

@@ -60,10 +60,11 @@ MailConnector.prototype.DataAccessObject = Mailer;
  * Example:
  *
  *   Email.setupTransport({
- *       type: 'SMTP',
+ *       type: "SMTP",
  *       host: "smtp.gmail.com", // hostname
  *       secureConnection: true, // use SSL
  *       port: 465, // port for secure SMTP
+ *       alias: "gmail", // optional alias for use with 'transport' option when sending
  *       auth: {
  *           user: "gmail.user@gmail.com",
  *           pass: "userpass"
@@ -89,7 +90,7 @@ MailConnector.prototype.setupTransport = function(setting) {
     transport = mailer.createTransport(transportModule(setting));
   }
 
-  connector.transportsIndex[setting.type] = transport;
+  connector.transportsIndex[setting.alias || setting.type] = transport;
   connector.transports.push(transport);
 };
 
@@ -128,7 +129,8 @@ MailConnector.prototype.defaultTransport = function() {
  *   to: "[email protected], [email protected]", // list of receivers
  *   subject: "Hello ✔", // Subject line
  *   text: "Hello world ✔", // plaintext body
- *   html: "<b>Hello world ✔</b>" // html body
+ *   html: "<b>Hello world ✔</b>", // html body
+ *   transport: "gmail", // See 'alias' option above in setupTransport
  * }
  *
  * See https://github.com/andris9/Nodemailer for other supported options.

test/email.test.js

@@ -37,6 +37,14 @@ describe('Email connector', function() {
 
     assert(connector.transportForName('smtp'));
   });
+
+  it('should set up a aliased transport for SMTP', function() {
+    var connector = new MailConnector({ transport:
+      { type: 'smtp', service: 'ses-us-east-1', alias: 'ses-smtp' },
+    });
+
+    assert(connector.transportForName('ses-smtp'));
+  });
 });
 
 describe('Email and SMTP', function() {