Rundeck Gmail SMTP not Working - smtp.gmail.com Un

I want to configure Rundeck to allow e-mail notifications.

My rundeck-config.properties is:

grails.mail.host = "smtp.gmail.com"
grails.mail.username = "name@domain.com"
grails.mail.port = 465
grails.mail.password = "******"
grails.mail.props = ["mail.smtp.starttls.enable":"true","mail.smtp.auth":"true","mail.smtp.socketFactory.port":"465","mail.smtp.socketFactory.fallback":"false"]

When I run the Job, the error I get is:

2016-05-05 14:49:30,557 ERROR NotificationService - Error sending notification email to me@gmail.com for Execution 11: Mail ser
ver connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: "smtp.gmail.com", 465; ti
meout -1;
  nested exception is:
        java.net.UnknownHostException: "smtp.gmail.com". Failed messages: com.sun.mail.util.MailConnectException: Couldn't connect to host,
port: "smtp.gmail.com", 465; timeout -1;
  nested exception is:
        java.net.UnknownHostException: "smtp.gmail.com"

I tried everything I could find on Google but the error keeps the same.

I also tried to telnet smtp.gmail.com 465 and it works

Could someone help me?

You Must need to use .groovy file as props is not supported in .properties file

below is my rundeck-config.groovy file which is working fine

loglevel.default="INFO"
rdeck.base="/var/lib/rundeck"
rss.enabled=false

dataSource.dbCreate = "update"
dataSource.url = "jdbc:h2:file:/var/lib/rundeck/data/rundeckdb;MVCC=true;TRACE_LEVEL_FILE=4"
grails {
  mail {
        host = "smtp.gmail.com"
        username = "************"
        port = 587
        password = "*********"
        props = ["mail.smtp.starttls.enable":"true","mail.smtp.auth":"true","mail.smtp.socketFactory.port":"587","mail.smtp.socketFactory.fallback":"false"]
  }
}
grails.serverURL="http://***.***.***.***:4440"

Reference: https://github.com/rundeck/rundeck/issues/1607

https://github.com/rundeck/rundeck/wiki/Faq#how-do-i-configure-a-smtp-server-for-email-notifications
https://github.com/rundeck/rundeck/wiki/Faq#how-do-i-convert-my-rundeck-config-file-to-groovy
https://github.com/rundeck/rundeck/wiki/Faq#how-do-i-specify-a-new-config-file-location