Many CMS applications (i.e. Drupal, Wordpress, etc.) offer the ability to register accounts from anonymous visitors. With this comes the necessity for your application to send outbound email to verify and communicate with the registered users. Standing Cloud offers the ability to use your own SMTP server, SendGrid, or Gmail.
If you choose to use your own Gmail account... you may want to consider enabling Google's Two-Factor Authentication to reduce the possibility of your Gmail account being compromised.
For more information on this and to set up and configure this extra layer of security for your Google account, please visit your Authorized Access to your Google Account page:
Once you have logged in to your Gmail account, you'll be able to create "Application Specific" passwords that are much more secure for your deployment.
Then you can return to your "My Add-ons" screen and re-enter your new password.