When I go into User Messages, all messages that have been sent to the message queue by anyone from our institution is present. It would be extremely helpful to be able to organize the messages by who sent them to the queue. If I am working with a particular group and need to go to the message queue and disburse emails in mass, it is hard to muddle through messages that have been sent by other people at different times for various reasons. Having a way to filter messages in the message queue by user would greatly increase the ability to stay organized and manage the disbursement of emails quickly.  It would also allow the message queue to be cleaned up periodically so that people can disburse or delete messages that they sent in.