One or more embodiments includes storing a group email message in multiple email mailboxes to obtain multiple stored email messages, receiving, for a first stored email message in the stored email messages, an updated label from a first user computing device, detecting, in response to receiving the updated label, that the stored email messages matches the first stored email message, and storing the updated label with at least a subset of the stored email messages. The method further includes transmitting, with the updated label and to a second user computing system, a second stored email message in the stored email messages.