Thank you for your message.
Could you please clarify what email provider do you use for specifying SMTP server settings?
If you use Gmail, there might be an issue with your account settings. You should enable access to your account for less secure apps. Please, refer to this help page for more information: https://support.google.com/accounts/answer/6010255?hl=en&authuser=1
Other email providers might have a similar setting that needs to be enabled.
If nothing helps I recommend that you try another SMTP provider, such as Mailjet
. Please, note that Remote Utilities configurator only provides an interface to embed our SMTP server data. It doesn't control how the SMTP server works and doesn't perform the actual sending - the SMTP server does.
Hope that helps.