Error processing unsubscribe message

I’ve started getting a few of these email unsubscribe errors that I need a bit of help please!

Code:

Laminas\Mail\Header\Exception\InvalidArgumentException: Error processing unsubscribe message (see internal_data/temp/email_unsubscribe_error.log): Invalid header value detected src/vendor/laminas/laminas-mail/src/Header/GenericHeader.php:64
Generated by: Unknown account Mar 4, 2024 at 4:13 PM

Stack trace
#0 src/vendor/laminas/laminas-mail/src/Headers.php(488)...

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