sender

It means customers don't have to wait at home for a delivery - the sender or parcel business emails or texts a code to unlock the locker.

The Welsh government said it would be up to the sender to release the letter.

Consumers should also avoid engaging with unsolicited messages from unknown senders.

Simply put, text messages or calls are seen only by you, the sender and whoever is in your Signal group chat.

Simply put, it means only the sender and the receiver can read messages - even Signal itself cannot access them.