我们正在推进 List-Unsubscribe 标头的实施，以遵守 Gmail 发件人指南。在进行测试时，我们注意到“从邮件列表退订”链接没有出现在收件人端的 Gmail 客户端中。
对于这个问题，有什么潜在的原因吗？
下面，我提供了标题数据（出于隐私考虑，一些信息被编辑）。
Delivered-To: ****@*******.***
Received: by 2002:a05:6520:4646:b0:283:91a:1adb with SMTP id el6csp795303lkb;
Thu, 7 Dec 2023 01:47:51 -0800 (PST)
X-Google-Smtp-Source: AGHT+IGkrxRIriFcwqWDTLZPZDyX5RuCa+ot/NqD6tt21gj6L277nrfC2x3Zl7JRzTu1QcYm9j7i
X-Received: by 2002:a05:6a20:1444:b0:187:eea9:73c5 with SMTP id a4-20020a056a20144400b00187eea973c5mr2887137pzi.3.1701942471560;
Thu, 07 Dec 2023 01:47:51 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1701942471; cv=none;
d=google.com; s=arc-20160816;
b=GS5MDCFcvdw0Nx38THlBQmTf/KBckJf9kIS2ZKCVZoYvIdheBNA4vrTcYERxOILXIF
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weqw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=content-transfer-encoding:date:errors-to:from:list-unsubscribe
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bh=f6DQBjo8rYX19JpB+nIPzKzcW1UlXBE5kq7UPzfAJfg=;
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8+7Q==
ARC-Authentication-Results: i=1; mx.google.com;
spf=pass (google.com: domain of *****-*********-****************@*******.*** designates xxx.xxx.xxx.xxx …