newsletter template is present /apps/geometrixx/templates/newsletter

I'm using the default campaign newsletter and trying to send mails via my gmail SMTP account. The mail gets sent sucessfully. But it's been sent as blank/empty data with only subject text. Please help me to know the issue.I have set valid gmail id and password in "Day CQ Mailing WebPage Email Templa...

common SMTP settings for  CQ-mail service are already set using configuration tab of OSGI console.

Now i am able send email, but that mail content is empty... No newsletter inside email..

I am trying to send Newsletter to a set of recipients using below code    ResourceResolver resolver = resourceResolverFactory                .getAdministrativeResourceResolver(null);        Session session = resolver.adaptTo(Session.class);        PageManager pageManager = pageManagerFactory.getPage...