We have added another feature to our proven techniques for identifying form submissions as spam, which checks email addresses for validity. Email addresses typed by users in the HTML form are checked for technical accessibility. If an address is found to be invalid, it is filtered out as spam. This largely ensures that only mailings from genuine users are transmitted.
The address verification feature is available to all our users and can be activated in the panel in the spam settings of the form.
For more information on all spam prevention techniques, please refer to the documentation.