Default MMS File to big error

Ok so my brother has this phone, running cm7. I have a HTC Rezound, and when i try to send him a picture (about 500k) it always says "file to big". Is this normal for the phone or could it be related to cm7???

I havent had any problems sending it to other t-mobile customers in the past. I was able to send a 1mb file to a Sensation and Samsung galaxy s.

any help with be appreciated.
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