new Fax email even when failed

Hello,

latest 3.1.1-3 with latest fax-addon:
On incoming Fax it sends an e-mail “You have received a new Fax” even if it was just somebody accidentally dialing the fax-number. Only way to differentiate: It will not have an attachment (PDF).

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Can you please make it an option to sent an email if incoming Fax failed?

Thanks