Hi
How can I prevent eM Client for automatically labeling incoming e-mails?
If you set a Rule to categorize incoming emails, then you could delete or disable that Rule.
If you are using GMail, that is slightly different. GMail actually only has three folders: All Mail, Trash and Junk. The emails in the All Mail folder are labelled to indicate the “folder” they are in, so Inbox, Sent, etc. If you remove those labels, you will not have any emails in your Inbox or Sent folder in eM Client. They will only appear in the All Mail folder.
If it is the Important label that is of concern, please see Jay Ogram’s solution in https://forum.emclient.com/emclient/topics/new-mail-marked-as-important-category