Can't send MMS to Verizon

[nwaves]

I have 2 APN entries:

ATT WAP (not selected, not sure how it got there as I didn't set it)
APN: wap.cingular
Proxy: wireless.cingular.com
Port: 80
Username & password not set
Server: cingulargprs.com
MMSC: http://mmsc.cingular.com/
MMS proxy: wireless.cingular.com
MMS port: not selected
MCC: 310
MNC: 410
APN type: default, supl,mms
APN protocol IPV4
APN enable/disable checked and greyed out: APN enabled
Bearer: unspecified

straight talk (selected, I set it up manually)
APN: att.mvno
Proxy: not set
Port: 80
Username & password not set
Server: not set
MMSC: http://mnsc.cingular.com
MMS proxy: 66.209.11.33
MMS port: 80
MCC: 310
MNC: 410
Auth type: not set
APN type: not set
APN protocol: IPv4
APN roaming protocol: IPv4
APN enable/disable checked and greyed out: APN enabled
Bearer: Unspecified

I can send/receive MMS to/from another Straight Talk AT&T user, but it fails to send/receive MMS from Verizon users.

 

[nwaves]

Never mind, found the problem, it was a typo. MMSC was set to http://mnsc.cingular.com instead of http://mmsc.cingular.com