【正文】 ..................................................................................22 日志和審計功能 ....................................................................................................22 證書管理功能 ........................................................................................................22 用 RSA 密鑰算法，支持標(biāo)準(zhǔn) PKI－ CA 系統(tǒng) ......................................................23 兼容性好 ...............................................................................................................23 系統(tǒng)管理員功能 ....................................................................................................23 域管理員功能 ........................................................................................................24 普通用戶功能 ........................................................................................................24 郵件系統(tǒng)監(jiān)控 ........................................................................................................24 易郵 YMailserver 致力于提供最優(yōu)秀郵件系統(tǒng) 易郵 YMailserver 第 – 3 – 頁 郵件系統(tǒng)的反垃圾和防病毒措施 垃圾郵件模塊功能和實現(xiàn)原理 ............................25 病毒模塊的功能和原理 ..........................................................................................26 WebMail 頁面服務(wù)器的性能 .................................................................................32 設(shè)計篇 ........................................................................................................................................................... 32 系統(tǒng)設(shè)計 .....................................................................................................................32 設(shè)計目標(biāo) ...............................................................................................................32 底層堅固、高度穩(wěn)定。 ..........................................................................................32 容易管理、維護。 .................................................................................................33 增加設(shè)備簡單、有效。 ..........................................................................................33 具有多級權(quán)限管理，支持企業(yè)全面發(fā)展。 ..............................................................35 高度模塊化，模塊之間最小耦合。 ........................................................................35 提 供與其它系統(tǒng)直接的接口：如計費平臺、短信彩信平臺、 防毒網(wǎng)關(guān)等 ..............35 應(yīng)用層二次開發(fā)、部署簡單方便。 ........................................................................35 設(shè)計理念 ...............................................................................................................36 郵件系統(tǒng)架構(gòu)建設(shè)分階段圖解 ...............................................................................36 統(tǒng)一存儲 ...............................................................................................................36 分布式存儲 ...........................................................................................................36 架構(gòu)選擇 ..............................................................................................................37 基礎(chǔ)運行環(huán)境要求 .................................................................................................37 雙機熱備方案（推薦） ..........................................................................................37 雙機冷備方案 ........................................................................................................38 雙機熱備方案描述 .................................................................................................39 方案篇 ........................................................................................................................................................... 42 實施篇 ........................................................................................................................................................... 44 網(wǎng)絡(luò)環(huán)境要求 ...............................................................................................................44 用戶遷移 ......................................................................................................................45 關(guān)于現(xiàn)有郵件系統(tǒng)的合并與處理 ...................................................................................46 數(shù)據(jù)回遷 ......................................................................................................................47 反垃圾措施 ..................................................................................................................47 培訓(xùn)篇 ........................................................................................................................................................... 53 系統(tǒng)管理員培訓(xùn) ...........................................................................................................53 操作培訓(xùn) .....................................................................................................................54 服務(wù)篇 ........................................................................................................................................................... 55 服務(wù)承諾 .....................................................................................................................55 服務(wù)支持體系的構(gòu)成 ....................................................................................................55 電話支持中心 ........................................................................................................55 遠(yuǎn)程在線診斷和故障排除 ......................................................................................55 定期巡查服務(wù)。 ....................................................................................................56 服務(wù)等級以及劃分 .......................................................................................................56 故障等級設(shè)定 ........................................................................................................56 優(yōu)先級的劃分及處理 .............................................................................................56 外包服務(wù)措施 ..............................................................................................................57 服務(wù)內(nèi)容 ......................