Just want to add that I too would like to have a way for new customers who email create support tickets as we are a new start-up. A workaround I've implemented is to have all emails that are received by the dedicated mailbox, forwarded to all my team members individually so we don't miss an email. The downside to this is we get a copy of emails that did process successfully, and tickets are created too.
Monitoring the dedicated mailbox for receiving support tickets into ITFlow doesn't scale very well when you have multiple people with set job duties on the team. For example, I have a dedicated Sales and Marketing guy on my team. I want him to get the notification that the email failed to process as soon as possible.
Personally, what I would love to happen is when an email is "Flagged" in cron_ticket_email_parser.php, the email is forwarded to a set email address with the "error: Failed to process email - flagging for manual review." Then I could have these support requests from new or unknown contacts go directly to my Sales Guy to get them added as contacts in ITFlow and/or negotiate a contract and pricing.