qreceipt - respond to delivery notice requests
in .qmail: |qreceipt youraddress
When a mail message arrives with youraddress listed in a Notice-Requested-Upon-Delivery-To header field, qreceipt sends a success notice back to the envelope sender. WARNING: If you create a .qmail file to enable qreceipt, make sure to also add a line specifying delivery to your normal mailbox. For example: /home/joe/Mailbox |qreceipt joe@nowhere.mil
dot-qmail(5), envelopes(5)