MailServer建置与管理维护-台湾大学计算机及资讯网路中心资讯网.ppt

Mail Server建置與管理維護;Outline ;Part I;電子郵件系統架構介紹;電子郵件概念;Mail User Agent;Mail Transfer Agent;Mail Delivery Agent;Email delivery;電子郵件傳輸;TCP/IP standards for email service;SMTP;直接利用SMTP寄信;john@hostA:~ telnet hostB 25 Trying 140.112.2.3... Connected to hostB.ntu.edu.tw. Escape character is ^]. 220 hostB.ntu.edu.tw ESMTP Sendmail 8.9.3/8.9.3; Wed, 4 Jul 2001 15:45:58 +0 CST) helo hostA 250 hostB.edu.tw Hello john@hostA.ntuedu.tw [140.112.3.75], pleased to meet you mail from: john@hostB.ntu.edu.tw 250 john@hostB.ntu.edu.tw... Sender ok rcpt to: john@hostC.ntu.edu.tw 250 john@hostC.ntu.edu.tw... Recipient ok data 354 Enter mail, end with . on a line by itself test. 250 UAA02587 Message accepted for delivery quit ;From john@hostB.ntu.edu.tw? Wed Jul 4 15:45:58 2001 Received: from hostB.ntu.edu.tw (hostB [140.112.2.3]) ???????? by hostC.ntu.edu.tw (8.8.5/8.8.5) with ESMTP id UAA05162 ??????? for john@hostC.ntu.edu.tw; Wed, 4 Jul 2001 15:45:58 +0800 (CST) Received: from hostA (john@hostA.ntu.edu.tw [140.112.3.75]) ??????? by hostB.ntu.edu.tw (8.8.8/8.8.8) with SMTP id UAA02587 ??????? for john@hostC.ntu.edu.tw; Web, 4 Jul 2001 15:45:58 +0800 (CST) Date: Wed, 4 Jul 2001 15:45:58 +0800 (CST) From: staff john@hostB.ntu.edu.tw Message-Id: 199805211246.UAA02587@hostB.ntu.edu.tw test ? ;郵件傳遞流程;Mail Retrieval and Mailbox Manipulation Protocols;MIME;郵件路由 – Mail and DNS;;Mail RelayhostC IN MX 50 hostB.cc.ntu.edu.tw.hostC IN MX 100 hostD.cc.ntu.edu.tw.;區分Email流量型態;Patterns of modern email traffic;;;Email Forwarders;;;增加email service的可靠性;;;郵件系統架構的重要性;建置可靠的郵件系統;台大郵件伺服器架構;Part II;Sendmail;Sendmail – three important parts;Configuration files;sendmail.cf;aliases;Alias運作機制;relay-domains;/etc/mail/access;sendmail.cw;Smart Relay;Part III;Anti-Relay Anti-SPAM;Mail Relay;防範SPAM;防堵Incoming SPAM;Anti-SPAM on MTA;利用Filter過濾spam;避免outgoing SPAM;Anti-SPAM reference;Sendmail log;Sendmail統計數據