Why would my BB-Pearl "all of a sudden" stop receiving emails?

I've checked the service books and thats in order, I've done a battery pull, and I've NEVER SYNCHED to my MAC or have not downloaded anything third party application.

Even if I don't have the current OS, why 'all of a sudden'? My BB is one month old!

I've tested by attempting to send myself an email nothing! I've also tried using my work email to send a message to my bb and nothing!

Any recommendations would be helpful.

Rolo