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对于所有传入的 Yahoo 邮件,X-YMailISG 是一个可以检索到的传入邮件 ID 邮件。我想知道这在 IMAP 中是否可行,或者该字段是否完全用于其他用途?

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RFC 3501的第 6.4.4 节,您可以使用SEARCHorUID SEARCHHEADER限定符一起查找该消息的标识符。

引:

HEADER <field-name> <string>
         Messages that have a header with the specified field-name (as
         defined in [RFC-2822]) and that contains the specified string
         in the text of the header (what comes after the colon).  If the
         string to search is zero-length, this matches all messages that
         have a header line with the specified field-name regardless of
         the contents.
于 2012-09-25T22:44:27.053 回答