In a Windows Forms project, I used the SmtpClient and MailMessage class in order to send information by email.
Is there an equivalent for Windows Phone 8?
You can use Microsoft.Phone.Tasks.EmailComposeTask
to compose an e-mail using the inbuilt mail client:
var task = new EmailComposeTask {To = email};
task.Show();
Alternately you can post data to a 3rd party service, such as SendGrid
to send the e-mail via an API.
There are no SMTP APIs available on Windows Phone.