Using iPhone 2.1 software, Zimbra 5.0.10 on RHEL4, Edge not 3G connect.

Sync works fine with incoming messages and calendar with Zimbra defined as Exchange.

However, when I reply from iPhone, these messages are not anywhere in Zimbra. (e.g. Sent folder).

How can I correct this? I am losing any responses sent from the iPhone.

TIA, Mark