Jenkins Email Error: Network is unreachable

Jenkins > Email > Network is unreachable error

send failed, exception: javax.mail.MessagingException: Could not connect to SMTP host:     , port: 25;
nested exception is:  java.net.SocketException: Network is unreachable: connect

Solution:

The problem is because java 1.7 uses IPv6 by default.
To fix this add Java Option from command line:

setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true**

Set Next Build Number Jenkins

Jenkins > Next Build Number

Install plugin Next Build Number

https://wiki.jenkins-ci.org/display/JENKINS/Next+Build+Number+Plugin

After install you have to reload configuration from disk

Go to configure project and click on Set Next Build Number

Configure Jenkins to use Mercurial

Jenkins > Mercurial 

Mercurial Plugin: Install the Jenkins Mercurial Plugin first (read more https://wiki.jenkins-ci.org/display/JENKINS/Mercurial+Plugin)

Source Code Management: Configure for Mercurial

Reduce unnecessary builds by specifying a comma or space delimited list of "modules" within the repository. A module is a directory name within the repository that this project lives.

To do that press advanced button:

This will detect changes only in sdks subdirectory in src directory: