Hi Xu Jay,
Your email states, you have problem in receiving email but the screenshot that you had kept on the post is for pub.client:smtp (which is used to send email)… Hope the below info will be useful for you to debug…
Go to Administrator webPage > Security > Ports > Add Port
select webMethods/Email
select default package to receive emails (or leave default WmRoot)
enter email account info in Server Information section
enter name of Default service eg: MyFolder:MyService
email arrives in pipeline as object called “contentStream” so define an input object type for the service called “contentStream”