mail Linux教学课件.ppt

Cryptography Postfix Postfix Aliases, newaliases /etc/aliases ? /etc/aliases.db /etc/postfix/main.cf ? /etc/postifx/master.cf postconf –e -a -n -d -m myhostname mydomain mynetworks mydestination myorigin：发件人地址伪装, obamba inet_interfaces: 定义postfix进程监听的IP地址 : 查找表: lookup table smtpd_client_restrictions = check_client_access hash: smtpd_helo_restrictions sender recipient data jerry@ Smtp, 终端 MUA: Mail User Agent MTA: Mail Transfer Agent MRA: Mail Retrieval Agent 分拣 Protocols SMTP, 25/tcp ESMTP POP3, 110/tcp IMAP4, 143/tcp MTA SMTP服务器 Sendmail Postfix Qmail Exim Exchange Domino MUA OE Outlook Foxmail Thunderbird mutt MDA procmail maildrop MRA dovecot courier-imap cyrus-imap (sendmail)smtp, smtpd tom@ Relay(关闭Open Relay) jerry@ tom@ MapReduce tcp mbox, maildir username@domain.ltd @ IN MX 10 MUA Mail Service Protocol mime: Multipurpose Internet Mail extensions pop3: Post Office Protocol, 110/tcp imap4: Internet Mail Access Protocol, 143/tcp smtp: Simple Mail Transfer Protocol, 25/tcp 数据流 ftp ? uucp: Unix to Unix Copy smtp: 文本、送达至、明文 Mailframe, stmp MX: smtp: gentoo@ MX: redhat@ gentoo@ /var/mail/redhat, /var/spool/mail smtpd, postfix, postfix组, 写 mail from, rcpt to mbox: smtpd， smtp, mail deliver foxmail, outlook express pop3,imap4; smtp Relay: Open Relay 基于IP的认证 基于用户的认证 SASL: smtp： 不支持认证 SASL simple authentication secure layer sasl2 cyrus-sasl, saslauthd，sasl认证服务 sasl: 认证框架 login plain 法*lun*功 垃圾邮件过滤器，根据邮件的内容对邮件检查 smtp spamassassin 病毒防护软件 clamav，病毒邮件网关 caller MTA, smtp服务器 Mail Transfer Agent Exchange, 异步消息协作平台 Lotus Notes Domino sendmail postfix, ibm 模块化 安全性高 投递效率是sendmail的4倍 qmail exim MDA, Mail Delivery Agent procmail maildrop, courier套件 MRA, Mail Retrieval Agent courier-imap cyrus-imap dovecot webmail, 动态网站 CA smtp ssl S/MIME PGP?GPG smtps, 465/tcp pop3 ssl pop3s: 995/tcp imap4: imaps: 993/tcp MUA, Mail User Agent oe foxmail mutt webmail MSA: Mail Submission Agent DNS, RBL 病毒特征码 smtp ssl, S/MIME GPG, PGP pop3 ssl, pop3s(995) imap4 ssl, imaps(99