very urgent! outgoing replies

[aaaale]

Hello, I really need urgent help.

I set up an automatic email responder in Roundcube, but something went very wrong: it started replying not only to new incoming messages, but also to very old emails, even from two years ago.

Now I have a huge sending queue with hundreds of outgoing replies. How can I stop or cancel this queue immediately?

Thank you very much for your support.