Mail 16中用AppleScript读取邮件主题失败问题排查

你的脚本能触发并显示"here"，说明规则和循环逻辑没问题，问题出在display dialog subs as rich text这一行。

原因分析 #

新版本的AppleScript或Mail应用对display dialog的as rich text参数处理有变化：邮件主题（subject）本身是纯文本类型，强行指定as rich text会导致弹窗无法正常渲染，又因为Mail规则触发的脚本默认不显示错误提示，所以看起来无反应。

解决方案 #

方案1：移除as rich text参数

直接使用纯文本显示主题，这是最稳妥的方式，因为邮件主题本身就是纯文本：

using terms from application "Mail"
    on perform mail action with messages these_messages for rule this_rule
        tell application "Mail"
            display dialog length of these_messages as text
            repeat with an_email in these_messages
                display dialog "here"
                set subs to subject of an_email
                display dialog subs -- 移除as rich text
            end repeat
        end tell
    end perform mail action with messages
end using terms from

方案2：添加错误捕获排查问题

如果需要确认具体错误，可以给弹窗代码加上错误捕获，强制显示错误信息：

using terms from application "Mail"
    on perform mail action with messages these_messages for rule this_rule
        tell application "Mail"
            display dialog length of these_messages as text
            repeat with an_email in these_messages
                display dialog "here"
                set subs to subject of an_email
                try
                    display dialog subs as rich text
                on error errMsg
                    display dialog "错误信息：" & errMsg
                end try
            end repeat
        end tell
    end perform mail action with messages
end using terms from

方案3：显式转换为富文本（若需格式支持）

如果你的邮件主题确实包含富文本格式（极少情况），可以先将文本转换为富文本对象再显示：

using terms from application "Mail"
    on perform mail action with messages these_messages for rule this_rule
        tell application "Mail"
            display dialog length of these_messages as text
            repeat with an_email in these_messages
                display dialog "here"
                set subs to subject of an_email
                set rich_subject to subs as rich text
                display dialog rich_subject
            end repeat
        end tell
    end perform mail action with messages
end using terms from

内容的提问来源于stack exchange，提问作者Greg Humphrey