Tell the court that the other party received a summons or other legal papers in a civil case that were delivered to (served on) that party. If you return this form to the sender, service of a summons is deemed complete on the day you sign the acknowledgment of receipt below.The person who is serving the summons, complaint and acknowledgment (POS015) fills this out and you file it all with the clerk. Acknowledgement Receipt. Cal. Super. Once completed, note the SST number and come into our office to finish the process.