Can't Email Audio To My Phone Anymore

To make my own ringtones, I use to use a wav editor to trim a small part of a song and the email it to my phone like 000-000-0000@vzwpix.com. It would work perfectly but now whenever I do it i get a mail failure notice...At first I thought maybe the files were to large even tho before I would send files bigger than the ones that were failing...but then i would send like a 5 second clip that was like 56kb and it still wouldn't work....anyone know whats up? the only difference in my plan that i know of is that my non-in-text messaging has gone from 500 a month to 1500