Problem with Email Notification and Email Check ( pop3 )

[Juato4]

I have a work email pop3, is not a gmail account. Well, i have putted to be notified in 1 hour if i have new emails... the problem is the phone didnt check the emails and didnt have the notifications... only if i enter on the "Mail" application i have the new emails.. if i didnt enter, this didnt check the emails.

What is the problem?.

I have APNdroid installed and i have desactivated the 3g 2g grps. But i have configurated the WIFI to stay connected always.

Any suggest? Is a common problem, a bug?, or i am making something bad?.

Thanks for read!.