If you want to mark spam in Gmail, then you should tap on the square next to the email and then tap on the stop sign icon.
In case, a user find a spam email in their inbox, then you ought to not delete the message but you ought to mark it as spam. This may send the e-mail to the spam folder. In case, you get more emails from this address, then the spam filter won't send it to your inbox. www.webroot.com/safe
