When this #drupal error happens, you will get an error message such as this;
Error : Unable to send #email. Contact the site #administrator if the problem persists.
To fix this error;
- This issue is with your mail server or #SPAM filters and not the Webform module. You can try the #SMTP #module.
More Info >>
https://ibmimedia.com/blog/89/drupal-unable-to-send-email-error
