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as stated in the title, my roundcube (mail-server setup with mailcow with docker) generates this error-message. It pops up whenever I try to send any mail and I do not receive any more mails. I'm running Debian 8.

I don't know which information could be useful additionally so feel free to ask.

Thank you very much in advance for your help!

Clueless regards, Tw1x

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