Troubleshooting: Duplicate e-mails created by IMAP
This past week we had a prospective customer putting one of our Zimbra hosting services through the wringer, testing e-mail, calendar and contact synchronization. He noticed when moving e-mail from his inbox to a subdirectory (aka directory or folder), he duplicated e-mail instead of the expected process of “moving” e-mail: copying and deleting.
We traced this anomaly to his testing environment: he had both the Zimbra web interface open and Mail.app. We suspected because they are both active IMAP clients attempting to synchronize their data with the server, organizational changes made in one while the other is also operating may lead to the unintended duplication of some e-mail.

