IMAP - 通過Yahoo檢索郵件X-YMailISG

Question

對於所有傳入的Yahoo郵件都顯示，X-YMailISG是可以檢索到的傳入郵件ID郵件。我想知道這是否可能在IMAP中，或者如果這個領域完全用於其他東西？

Answer 1

從RFC 3501，第6.4.4節，你可以使用SEARCH或UID SEARCH與HEADER預選賽看認準標識該消息。

報價：

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.