IMAP Mailbox setting Deletewhendone = false and IMAPsearch = Undeleted causes indexed mail to be indexed again

[d4rk_sp1d3r]

Hi.

I configured IMAP mailbox on a distributed setup. The setting is DeleteWhenDone =False and IMAPsearch = UNDELETED. This causes splunk to index the same email every script run. Is there a configuration that i can do for it not to download the same indexed email again? The requirement is not to delete the email from the server DeleteWhenDone = False.

Regards,
Ronald

[d4rk_sp1d3r]

or is it a normal behavior for it to index the same undeleted email if this is the setting?