I see this in the headers. But there was no option in the MacOS Mail client to unsubscribe. Only the Unsubscribe link in the body of the email.

Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=member.24hourfitness.com; s=twentyfourhour; t=1762443065; bh=KDZeTqKlOBd6YUTrR6K4RMz9MA2BueBl6/LnKG57yqY=; h=From:Date:Subject:To:MIME-Version:Message-ID:List-Unsubscribe: Content-Type; b=Bq6qnq65i1EN6Df9A5TpcCn3AnNzE8yjkNdDYkapehQV727Jrma15ZU4e88I8Ckdk iH5CZrtJPlNqPscm3JWbuP4IavLVKDNf3Prlm4q75tTXE0IyaTPexyOoGTu+4PoAeG wEa8WaN6zfLl5AkPO0U+zjFHicSx3ooyNomFTI2AtSVoVHVPcubtZV8wRPUy4EV9mV pRBroHp1Uj/LCFRyZRScbs5plfxEpmd3wO9vnMsXW6jqOi19kqfOkhTUKpaRVxxJA+ /cMIq+Wh4TSpt6+22gcm4hLsCVNW0mAImjTZZ/yPFwoGpLaoPOia8aYde1mlROOoZi yx81OFO+90kRQ==

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throw0101c 2 hours ago | parent | next [-]

> But there was no option in the MacOS Mail client to unsubscribe.

The functionality for mail clients to offer an "unsubscribe" button is dependent on there being a "List-Unsubscribe" header in the e-mail with a URL:

* https://datatracker.ietf.org/doc/html/rfc8058

* https://datatracker.ietf.org/doc/html/rfc2369#section-3.2

If the sender does not put one in then that's hardly the mail client's fault.

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iamacyborg 3 hours ago | parent | prev [-]

MacOS should have list unsub support from what I can see: https://support.apple.com/en-gb/guide/mail/mlhld3405766/mac

	▲	throw0101c 2 hours ago \| parent [-]
		Dependent on the e-mail sender putting a header with a URL in the message: * https://datatracker.ietf.org/doc/html/rfc8058