This is very disturbing. I loaded up Kontact this morning to check my email. I noticed that it seemed to be more active than usual. I have around 15 email accounts, all IMAP. While reading the emails in one of my Gmail accounts, two emails disappeared right before my eyes. These emails were something I actually wanted to read. I checked the trash to see if I had accidentally deleted them. They are not in the trash.
After some time, I figured out what was going on. In the status bar to the left it showed a message that a large number of emails were waiting to be filtered. I clicked for status details on the right and a lot of messages like this were scrolling by:
Downloading message data...
Uploading Message data...
Moving messages...
I have no idea where the messages were moved to, because the status didn't give any details. I didn't accidentally apply any filters. To do so requires a right click then navigating to a submenu and selecting the filter to be applied, after selecting all the messages in the account.
I do have the Bogo spam filter activated, but I'm not sure why it would suddenly decide to run like this on a single email account and delete important emails. Luckily this is a Gmail account and I didn't activate permanently deleting emails, so I can still access the emails in the All mail folder online. I checked the Spam folder for Gmail online and the messages are not in there.
It is very scary that Kmail is suddenly running a filter on an entire email account, uploading, and moving messages to some unknown location. If this had happened on one of my regular, important IMAP accounts, it would be a disaster.
Any ideas what happened and how I can figure out where the messages were moved to?