Cancel Mail Import

Where is the cancel button for mail import in Devonthink pro?

There’s no cancel button.

If you have thousands of email messages, it’s probably best to import them a couple of hundred or so at a time. For example, Start with the oldest messages and stop the selection at a certain date. Note the date, and next time start your selection to be imported just more recent than that, and so on. Or do it by individual mailboxes.