need to send grid data from mashup into the e-mail

You just need to fill a String with the desired html format and send it with a Thing which derived MailServer ThingTemplate (that you will find on Marketplace Extension: https://marketplace.ptc.com/apps/193028/mail-extension )

var emailContent = "<html><body>\
 <table>\
 <tr><td>Column1</td><td>Column2</td></tr>\
 <tr><td>RowValue1</td><td>RowValue2</td></tr>\
</table></body></html>"

Things["YourMailServerThing"].SendMessage({
 from: "youremail@yourmailserver",
 to: "email_destination@anothermailserver",
 subject: "Awesome email, with a table :P",
 content: emailContent
});