Great help source - email accts.
I was having several problems with my Bold's email. One of the 3 email accounts would only get email after a several hour delay, I hated the "Blackberry" signature, etc.
Take the time to set up and use your Blackberry Internet Service. I'd set up an acct. on the device when I first got it but I'd never used it and didn't even know what it offered. My provider is ATT and the help people were great. I set up a new, internet-based, account and deleted and readded all my email accts. It made a world of difference.
You can create custom signatures outside of an enterprise server. You can easily change the "from" field for email sent from your device, etc.
It's well worth taking the time.