Delivery of a message over a communications network from a sender based on a single delivery address. The single delivery address is generated as one unit for the message. The single delivery address has a collection of recipient addresses including one or more recipient addresses each identifying at least one recipient of the message. Each of the one or more recipient addresses includes a user level information and a domain level information. The generated single delivery address with the collection of recipient addresses is included in the message. A copy of the message is provided to the identified recipient(s) as a function of the domain level information of the one or more recipient addresses. The message is transmitted over the communications network to the identified recipient(s) recipient based on the collection of recipient addresses.