A method implemented at an electronic device, the method comprising: detecting input of a partial recipient identifier in a recipient identifier entry field (310, 320) of a message composition screen displayed at the electronic device; in response to detecting the input, presenting an initial set of suggested entries (362, 364, 366, 368) matching the partial recipient identifier for selection for the recipient identifier entry field (310, 320), the initial set (362, 364, 366, 368) comprising at least one entry having a combination of recipient identifiers (372, 374) specified in a previous message, where at least one recipient identifier of the combination of recipient identifiers matches the partial recipient identifier, wherein presenting the initial set of suggested entries (362, 364, 366, 368) comprises: locating, in at least one data store of the electronic device, one or more sent messages addressed to a recipient identifier matching the partial recipient identifier, and for each located message addressed to multiple recipient identifiers, obtaining the multiple recipient identifiers (372, 274) and presenting the multiple recipient identifiers as a combination of recipient identifiers in a single entry; while the initial set of suggested entries (362, 364, 366, 368) is displayed, detecting a change to the partial recipient identifier in the recipient identifier entry field (310, 320); and in response to detecting the change, updating the initial set of suggested entries (362, 364, 366, 368) and presenting the updated set of suggested entries in place of the initial plurality of suggested entries (362, 364, 366, 368). detecting input of a partial recipient identifier in a recipient identifier entry field (310, 320) of a message composition screen displayed at the electronic device; in response to detecting the input, presenting an initial set of suggested entries (362, 364, 366, 368) matching the partial recipient identifier for selection for the recipient identifier entry field (310, 320), the initial set (362, 364, 366, 368) comprising at least one entry having a combination of recipient identifiers (372, 374) specified in a previous message, where at least one recipient identifier of the combination of recipient identifiers matches the partial recipient identifier, wherein presenting the initial set of suggested entries (362, 364, 366, 368) comprises: locating, in at least one data store of the electronic device, one or more sent messages addressed to a recipient identifier matching the partial recipient identifier, and for each located message addressed to multiple recipient identifiers, obtaining the multiple recipient identifiers (372, 274) and presenting the multiple recipient identifiers as a combination of recipient identifiers in a single entry; while the initial set of suggested entries (362, 364, 366, 368) is displayed, detecting a change to the partial recipient identifier in the recipient identifier entry field (310, 320); and in response to detecting the change, updating the initial set of suggested entries (362, 364, 366, 368) and presenting the updated set of suggested entries in place of the initial plurality of suggested entries (362, 364, 366, 368). locating, in at least one data store of the electronic device, one or more sent messages addressed to a recipient identifier matching the partial recipient identifier, and for each located message addressed to multiple recipient identifiers, obtaining the multiple recipient identifiers (372, 274) and presenting the multiple recipient identifiers as a combination of recipient identifiers in a single entry; while the initial set of suggested entries (362, 364, 366, 368) is displayed, detecting a change to the partial recipient identifier in the recipient identifier entry field (310, 320); and in response to detecting the change, updating the initial set of suggested entries (362, 364, 366, 368) and presenting the updated set of suggested entries in place of the initial plurality of suggested entries (362, 364, 366, 368).