Attachment Dropped Error Message

[panther3423]

Hey all.. Trying to figure out why I'm getting an attachment dropped error message... A friend tried to send me an audio file in a text message and i get the following:

Attachment Dropped: <XXXXXXX.mp3.acc> of type: <audio/mpeg; name=XXXXXXXXX.mp3.aac>

Any ideas on why this could be happening at all? Thanks for all the help!!