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  • Using O12.18, mail retrieved from Yandex but not from other mail servers I use causes creation of a new label titled "encrypted" with Yandex mail listed under it. All my mail accounts are set up for IMAP TLS ports 993 and 465 so I am wondering what property could be triggering this behavior only in Yandex mail.

  • IMAP keywords. In the properties of a label, you can set a keyword for the label so that messages in the label get that keyword applied to them on the server so that other clients (that support IMAP keywords) can see it and make use of it.

    In Opera, when it recognizes a new IMAP keyword, it'll automatically create a label based on that keyword's name unless you already have a label with that keyword.

    It's kind of a way to sync labels across IMAP clients. Thunderbird uses them for its tags.

    So, either the Yandex mail server or its webmail or some other client you've used is making use of that "encrypted" keyword. It's probably using it to tag encrypted messages or something.