IMAP协议流程

搜索
A119 SEARCH header subject another

设置红旗标记
A04 STORE 3 +FLAGS (\Flagged)

获取红旗标记
A03 FETCH FLAGS Flagged

自定义旗帜标记
A04 STORE 3 +FLAGS ($Ouba)

搜索红旗标记
A09 SEARCH FLAGGED

搜索自定义标记
A11 SEARCH KEYWORD $Ouba

获取 10-01 前的已读邮件
A02 SEARCH SEEN since 1-may-2013 sentbefore 1-oct-2017

范围获取 UID
A05 FETCH 40000:40001 UID

A06 FETCH 200000:* UID
A06 FETCH 1:* UID

IMAP协议流程

原文：http://blog.51cto.com/net881004/2089353