IMAP import

Hi,

Is IMAP import a one-time operation or can I use it like POP Fetch to be set up and left to operate at time intervals?

Looking at IMAP Import - Runbox Help it says:

IMAP Import will copy all folders and email in another account to your Runbox account.

If it’s copying ‘all folders and email’ wouldn’t there be duplicates downloaded each time, unless you delete them in the source account at the end of every run?