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This is EXTREMELY frustrating. Has anyone else had a similar issue? Please tell me there is a fix for this! I am using Zimbra Web Client - FF3.0 (Win), version: 5.0.19_GA_3083.RHEL5_64
You'll have to ask the administrator of your mail server what the problem is and to investigate it for you, there's no specific answer to that error there could be multiple reasons it's occurring.