Problem Sending and Receiving Emails on Verizon Wireless

Hello,

I'm having an issue using Zimbra Email on my iPhone while on the Verizon Wireless network. When I'm on Wi-Fi or using my AT&T iPhone I'm not having any issues.

The issues are that sending emails just hangs out in the outbox and is not going anywhere. Also receiving emails takes a very long time.

We setup the account using Push Exchange Settings. Are we supposed to use it using imap?

Thanks so much for any help.


William