I think this is a problem with groups.io - I removed the user from the group, there's no-one with that address but still e-mails are being sent there.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of jdow via groups.io <jdow@...>
Sent: 24 September 2022 23:27
To: SDR-Radio@groups.io <SDR-Radio@groups.io>
Subject: [SDR-Radio] polgarjozsef@...
If he does not stop microweb.hu from spamming me with bounces microweb.hu will permanently as in forever will be trimmed off my email stream and not even placed into my spam bucket.
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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.