Same issue here. I have 21869 11/19 Leo version and installed the MMS fix from here
http://thewingster.com/mmsfixm25.aspx and mms won't send (Sprint). If I add the mms.sprintpcs.com IP to the IP Address field, it sends but is never received by the recipient. sms is working fine through Manila 2.5 with this fix, just not MMS for Sprint. Any ideas?