My client is getting the following message when replying to a message using versamail 3.5 on her palm 700p

She can compose a new message, and it sends out.

When she replies to a message, it fails.

AirSamSMEmail.c2385 6 400 can't process message server: Apache -Coyote/1.1 X-Powered - By: Zimbra Collabortaion Server Progra:no-cache P

Any ideas?