Nokia Messaging for Email, rolling out a update in few weeks. The important fix came out of your feedback related to Destinations support on Symbian^1 devices (like the Nokia 5800 and N97).
From Nokia Messaging Blog:
Several issues were resolved around reliable WLAN connectivity. Please note that there are two steps to successfully enabling WLAN roaming: add your WLAN access points to the Internet Destination, and then also enable WiFi “sniffing” so that the device will notice when it comes into range of a configured WLAN. This “sniffing” setting is found under Settings / Connectivity / WLAN / Settings / Scan for networks. You can then select your Destination profile inside of the Nokia Messaging client.