Hi Michael,
Could you please make sure your settings are set as per below:
MMS APN / TECHNICAL SETTINGS:
Name: Optus MMS
Home Page / MMSC: http://mmsc.optus.com.au:8002/
APN: MMS
Primary / MMS Proxy: 61.88.190.10
Port: 8070
MCC: 505
MNC: 02
Auth Type: PAP
APN type: mms
MMS Protocol (For Android 2.1 or higher):WAP 2.0
You must switch your device off and on again for these new settings to take effect.
Thinkmick