NICK PROPERTY: MRECEIPTS
Usage: PROP <nick> MRECEIPTS [<ON|OFF>]
This property will send you a notification memo when a user has read a memo you have sent to them. The default is OFF.
/uprop mreceipts on
If you need to know when someone has gotten the information you sent, then turn MRECEIPTS on. Also, this way if you do not get a memo, you will know that the one you sent was never read. It is best left off, to avoid pointless memos, unless you have a reason to desire the information.