# ACK messages

An ACK messages gives the confirmation that a PRIVATE arrived in tis destination back to the sender.

### How does an ACK message work ?

- An ACK message is requested with the string
  /ACK
  written by the sender inside his message in 1st column.
- When the message arrives in its destination, an ACK message is generated and sent back to the requester, including the date and eventually other informations.

### Protocol

- The SID of the BBS including this feature will have the letter "A"
- An ACK message is a short message including only text
- An ACK message is generated only on private mail, not on bulletins
- The message has a type "A" (private are "P", bulletins are "B")
- Only the first header forwarding line is generated, other BBS will not add their header forwarding line
- If the BBS which is forwarded does not include this feature, the message is changed to type "P" (Private).
- Type "A" message are not seen by users.
- When arriving back to its destination, the type of the ACK message is changed to type "P" (private) to be read by the requester.