sendmail function

I tried the sendemail function example below, obviously with other email adresses, but it does not seem to work. Does it only work on the web app or also with the OSX app ?

Is there a way to specify a mail server ?

Best regards

sendEmail({
from: "recipient@domain.com",
to: "recipient@domain.com",
subject: "Hello World!",
text: "Some text",
html: "<h1>Some Text</h1><i>With Markup</i>"
})