Issues storing SMTP Settings

Not able to setup SMTP as expected

Rocket.Chat Server 0.57.3
Debian 8
Number of Running Instances: 2
DB Replicaset Oplog: yes
Node Version: 4.7.1

Steps to Reproduce:

1. Login in as Admin
2. Setting up SMTP using WebGUI (filling the form)
3. Storing the Information
4. Getting popUp "Stored Sucessfully"
5. Sending Testmail to myself resulting an "internal error"

Expected behavior:

Able to send mails via SMTP

Actual behavior:

Just not working

Relevant logs:

[34mI20171031-16:40:26.789(0) Updating process.env.MAIL_URL
I20171031-16:41:44.982(0) Exception while invoking method 'sendSMTPTestEmail' TypeError: Cannot read property '0' of undefined at [object Object].Meteor.methods.sendSMTPTestEmail (/home/webmaster/Rocket.Chat/programs/server/packages/rocketchat_lib.js:14136:35) at [object Object].methodsMap.(anonymous function) (/home/webmaster/Rocket.Chat/programs/server/packages/rocketchat_lib.js:1028:26) at [object Object].methodMap.(anonymous function) (packages/rocketchat_monitoring.js:2731:30) at maybeAuditArgumentChecks (/home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:1823:12) at /home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:905:20 at [object Object]..extend.withValue (packages/meteor.js:1122:17) at /home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:904:41 at [object Object]..extend.withValue (packages/meteor.js:1122:17) at /home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:903:46 at [object Object]._.extend.protocol_handlers.method (/home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:876:21) at /home/webmaster/Rocket.Chat/programs/server/packages/ddp-server.js:755:85

Start at the sendSMTPTestEmail method in programs/server/packages/rocketchat_lib.js around line 14136 and review the logged TypeError when sending the SMTP test email. Reproduce the configured SMTP flow described in the issue; done means the test email sends successfully without the internal error.