Hi Noclue!
First, please have a look at Settings > Folders. Is there auto-purging set for your folder? If so, it would be shown below the folder name.
If there's no auto-purging set in your FastMail settings, it is most likely that one of your IMAP email clients like Outlook, Thunderbird, Apple Mail, etc. is emptying your folder. In that case you'd have to check your mail client settings.
If you're talking about your inbox that gets purged, then it also could be that you've set up POP retrieval to delete mails from the server on download.
Hope this could help you solve your problem?
Cheers,
Michael
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