Sendmail基礎(chǔ)與常見問題解決

1、Sendmail 基礎(chǔ)與常見問題解決基礎(chǔ)與常見問題解決 Netman ()* E-MAIL 協(xié)定簡介* DNS 與 E-Mail 的關(guān)系* Sendmail 運作流程* Sendmail 常見設(shè)定* Sendmail 常見問題與解決方案主題大綱主題大綱 v MUA&MTA-UserAgent:讀寫郵件,但不具備郵件遞送能力.-TransferAgent負(fù)責(zé)郵件遞送工作的接收.1.E-Mail協(xié)定簡介vMTA透過SMTP接收郵件並進(jìn)行遞送處理.v本機(jī)郵件將寫進(jìn)/var/spool/mail/user1.E-Mail協(xié)定簡介(SMTP)v SMTP運

2、作實例1.E-Mail協(xié)定簡介(SMTP)v本機(jī)MUA將/var/spool/mail/user的郵件搬至user/mboxvMUA也可透過POP從MTA下載郵件.1.E-Mail協(xié)定簡介(POP)v POP-3運作實例1.E-Mail協(xié)定簡介(POP)v POP-3運作實例(續(xù))1.E-Mail協(xié)定簡介(POP)v 發(fā)送端MTA透過DNS查訊接收端MTAv MX&A記錄的關(guān)係2.DNS與E-Mail的關(guān)係v DNS實例分析(1):usermy.domain$ORIGIN my.domain. IN A IN MX 10 host1.my.domain. host1 I

3、N A -郵件會轉(zhuǎn)到的SMTPport去.2.DNS與E-Mail的關(guān)係v DNS實例分析(2):usermy.domain$ORIGIN my.domain. IN MX 10 host2.my.domain. IN A host1 IN A -郵件將被退回2.DNS與E-Mail的關(guān)係v DNS實例分析(3):usermy.domain$ORIGIN my.domain. IN A host1 IN A -郵件會轉(zhuǎn)到的SMTPport去.2.DNS與E-Mail的關(guān)係v DNS實例分析(4):

4、usermy.domain$ORIGIN my.domain.host1 IN A -郵件將被退回.2.DNS與E-Mail的關(guān)係v 流程略圖3.Sednamil運作流程v主要判定設(shè)定點-e-mailaddress:userdomain-Sender&Recipient3.Sednamil運作流程v Local設(shè)定(比對右邊)-不帶的emailaddress-hostname-grepCw/etc/mail/sendmail.cf-cat/etc/mail/local-host-names4.Sednamil常見設(shè)定v Access設(shè)定(比對發(fā)信端與收信端)-/etc/m

5、ail/RELAY192.168.1OKFROM: REJECT “xxx!”DISCARD-cd/etc/mail;makemaphashaccess.db/etc/mail/sendmail.cfservicesendmailrestart5.Sednamil常見問題與解決方法v DaemonPort-vi/etc/mail/sendmail.mcdnl DAEMON_OPTIONS(Port=smtp,Addr=, Name=MTA)dnl-m4/etc/mail/sendmail.mc/etc/mail/sendmail.cfservicesendmailrestart5.Sednamil常見問題與解決方法v POP-/etc/xinetd.d/ipop3disable = no-servicexinetdrestart5.Sednamil常見問題與解決