A system and method concerned with supporting or implementing functionality to provide efficient delivery of MMS messages to a plurality of recipients. In at least one arrangement the delivery status of already transmitted MMS messages is monitored; for a plurality of messages having a delivery status indicating that the messages are undeliverable to the intended recipient, a new set of recipients is selected and MMS messages transmitted to the new set of recipients. In this way delivery of a desired quota of deliverable MMS messages is effected with greater efficiency than is possible with conventional methods.