Thanks for posting your question here. I'm afraid we do not offer any functionality that would accomplish what you have described here but we will treat your comments as a suggestion.
The only automatic email option we have available that is specific to consignment listings is the one labeled "Consignment" in the "Auto Email Management" section of the Account Preferences page. Having that setting enabled should make it so your consignors are automatically notified by email when their items are posted to eBay.
If you would like to review or make changes to your default Consignement email that is used for these notifications, you can do so by mousing over the "Sales" tab within your account and selecting the "Manage" option under "Custom Emails". If you then select "Consigment" from the "Show Only" drop down menu on that page, you should see it and be able to use the options in the Actions section to preview or modify it.
If you need any further assistance with your account, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.