Linux下sendmail郵件伺服器的加密與認證

sendmail郵件伺服器的加密與認證

對於郵件伺服器,有 許多客戶機/伺服器協議沒有驗證能力,sasl就是用於加強或增加這類協議的一種通用方法.當你設定sasl時,你必須決定兩件事；一是用於交換“標識信 息”（或稱身份證書）的驗證機制；一是決定標識信息存儲方法的驗證架構.sasl驗證機制規範client與server之間的應答過程以及傳輸內容的編 碼法,sasl驗證架構決定伺服器本身如何存儲客戶端的身份證書以及如何核驗客戶端提供的密碼.如果客戶端能成功通過驗證,伺服器端就能確定用戶的身份,並藉此決定用戶具有怎樣的許可權.對sendmail而言,所謂的“許可權”指的就是轉發服務的訪問權.你也可以決定通過驗證的用戶在轉發郵件時,是否要使用特 定的寄件人地址.

搭建郵件伺服器

郵件伺服器正常使用一般需安裝如下軟體：

sendmail-8.13.8-2.el5.i386.rpm 1. 安裝sendmail-cf

[root@localhost Server]# rpm -ivh sendmail-cf-8.13.8-2.el5.i386.rpm

2. 查看sendmail運行的埠 [root@localhost mail]# netstat -tupln |grep sendmail tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2674/sendmail: acce 3. 編輯sendmail.mc文件 [root@localhost Server]# cd /etc/mail [root@localhost mail]# vim sendmail.mc 116 DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl 4. 重啟sendmail服務 [root@localhost mail]# service sendmail restart Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: [ OK ] Starting sm-client: [ OK ] 5. 再次查看sendmail運行的埠 [root@localhost mail]# netstat -tupln |grep sendmail tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 3299/sendmail: acce 6. 在該域組內添加兩個用戶 [root@localhost mail]# useradd user1 [root@localhost mail]# useradd user2 [root@localhost mail]# echo "123" |passwd --stdin user1 [root@localhost mail]# echo "123" |passwd --stdin user2

7. 設置中繼 [root@localhost mail]# vim access 在access文件中添加如下 10 Connect:192.168.2.100 RELAY 8. 重啟sendmail服務 [root@localhost mail]# service sendmail restart 9. 測試能否給192.168.2.100 發/收郵件 [root@localhost mail]# telnet 192.168.2.100 25 Trying 192.168.2.100... Connected to 192.168.2.100 (192.168.2.100). Escape character is '^]'. mail from:aaa@aaa.com 220 localhost.localdomain ESMTP Sendmail 8.13.8/8.13.8; Wed, 21 Mar 2012 11:53:43 0800 250 2.1.0 aaa@aaa.com... Sender ok rcpt to:aa@163.com 250 2.1.5 aa@163.com... Recipient ok (will queue) quit 可以發/收郵件 10.在local-host-names文件中添加本地域名 [root@localhost mail]# vim local-host-names bj.com 11修改access文件 [root@localhost mail]# vim access Connect:192.168.2 RELAY sh.com RELAY bj.com OK 12.DNS伺服器的配置 bj架設自己的dns服務 1.安裝有關dns伺服器的主要軟體包 [root@localhost Server]# rpm -ivh bind-9.3.6-4.P1.el5.i386.rpm [root@localhost Server]# rpm -ivh bind-chroot-9.3.6-4.P1.el5.i386.rpm [root@localhost Server]# rpm -ivh caching-nameserver-9.3.6-4.P1.el5.i386.rpm 2.複製named.caching-nameserver.conf文件並命名為named.conf [root@localhost Server]# cd /var/named/chroot/etc/ [root@localhost etc]# cp -p named.caching-nameserver.conf named.conf 3.編輯name.conf文件 [root@localhost etc]# vim named.conf 15 listen-on port 53 { any; }; 27 allow-query { any; }; 28 allow-query-cache { any; }; 36 view localhost_resolver { 37 match-clients { any; }; 38 match-destinations { any; }; 39 recursion yes;

40 include "/etc/named.rfc1912.zones"; 4.編輯區域聲明文件（正/反方向解析） [root@localhost etc]# vim named.rfc1912.zones 複製15-19 並修改 20 zone "bj.com" IN { 21 type master; 22 file "bj.com.db"; 23 allow-update { none; }; 24 }; 複製44-48行 添加如下： 50 zone "2.168.192.in-addr.arpa" IN { 51 type master; 52 file "192.168.2.db"; 53 allow-update { none; }; 54 }; 5.生成資料庫文件 [root@localhost etc]# cd ../var/named/ [root@localhost named]# cp -p localhost.zone bj.com.db [root@localhost named]# cd /var/named/chroot/var/named/ [root@mail named]# cp -p named.local 192.168.2.db 6.編輯資料庫文件 [root@localhost named]# vim bj.com.db

[root@mail named]# vim 192.168.2.db

100 IN PTR mail.bj.com. 101 IN PTR mail.sh.com.

7.設置開機自動啟動dns,並啟動dns服務

[root@localhost named]# chkconfig named on [root@localhost etc]# service named start Starting named: [ OK ] 8.設置dns指向 [root@localhost etc]# vim /etc/resolv.conf nameserver 192.168.2.100 9.編輯network文件 [root@localhost named]# vim /etc/sysconfig/network HOSTNAME=mail.bj.com 10編輯hosts文件. [root@localhost named]# vim /etc/hosts 127.0.0.1

mail.bj.com localhost.localdomain localhost 11.重啟系統 [root@localhost named]# init 6 12．查看dns和sendmail伺服器的狀態 [root@mail ~]# service named status server is up and running named (pid 2378) is running... [root@mail ~]# service sendmail status sendmail (pid 2704) is running... 13.檢測dns能否解析 [root@mail ~]# nslookup > set q=any > mail.bj.com Server: 192.168.2.100 Address: 192.168.2.100#53 Name: mail.bj.com Address: 192.168.2.100 14.使用Windows測試內部郵件的發送 使用Outlook Express 步驟如下:

完成user1賬戶的創建

創建郵件併發送：

發送后在sendmail伺服器日誌上查看 [root@mail ~]# tail -f /var/log/maillog Mar 21 17:03:22 mail sendmail[3336]: q2L93MSd003336: from=<user1@bj.com>, size=409, class=0, nrcpts=1, msgid=<AA961B346B454E0884074973A8AA3E43@usergsc>, proto=SMTP, daemon=MTA, relay=[192.168.2.10] Mar 21 17:03:22 mail sendmail[3339]: q2L93MSd003336: to=<user1@bj.com>, ctladdr=<user1@bj.com> (500/500), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30566, dsn=2.0.0, stat=Sent 可以看出已經成功發送！！！ 14.為郵件服安裝接受郵件伺服器（dovecot） [root@mail ~]# yum install -y dovecot 15.編輯dovecot文件 [root@mail ~]# vim /etc/dovecot.conf 修改如下： 20 #protocols = imap imaps pop3 pop3s 21 protocols = imap pop3 16.設置dovecot服務為開機自動啟動,並重啟該服務 [root@mail ~]# chkconfig dovecot on [root@mail ~]# service dovecot restart Stopping Dovecot Imap: [ OK ] Starting Dovecot Imap: [ OK ] 17.查看運行該服務的埠 [root@mail ~]# netstat -tupln |grep dov tcp 0 0 :::110 :::* LISTEN 3507/dovecot

tcp 0 0 :::143 :::* LISTEN 3507/dovecot 18.檢測郵件能否正常接收

[root@mail ~]# tail -f /var/log/maillog Mar 21 17:40:02 mail dovecot: Dovecot v1.0.7 starting up Mar 21 17:40:02 mail dovecot: Generating Diffie-Hellman parameters for the first time. This may take a while.. Mar 21 17:40:09 mail dovecot: Killed with signal 15 Mar 21 17:40:09 mail dovecot: Dovecot v1.0.7 starting up Mar 21 17:40:09 mail dovecot: Generating Diffie-Hellman parameters for the first time. This may take a while.. Mar 21 17:45:41 mail dovecot: pop3-login: Login: user=<user1>, method=PLAIN, rip=::ffff:192.168.2.10, lip=::ffff:192.168.2.100 可以看出users1能正常接受郵件！！！ 郵件伺服器的加密與認證 查看編譯信息 [root@mail ~]# sendmail -d0.1 -bv Version 8.13.8 Compiled with: DNSMAP HESIOD HES_GETMAILHOST LDAPMAP LOG MAP_REGEX MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS TCPWRAPPERS USERDB USE_LDAP_INIT ============ SYSTEM IDENTITY (after readcf) ============ (short domain name) $w = mail (canonical domain name) $j = mail.bj.com (subdomain name) $m = bj.com (node name) $k = mail.bj.com ======================================================== Recipient names must be specified [root@mail ~]# telnet 127.0.0.1 25 Trying 127.0.0.1... Connected to mail.bj.com (127.0.0.1). Escape character is '^]'. 220 mail.bj.com ESMTP Sendmail 8.13.8/8.13.8; Fri, 23 Mar 2012 15:54:24 0800 EHLO 127.0.0.1 250-mail.bj.com Hello mail.bj.com [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-DELIVERBY 250 HELP QUIT 發送郵件伺服器 starttls（smtp ssl） 建立伺服器證書 [root@mail ~]# cd /etc/pki/CA/ [root@mail CA]# cd .. [root@mail pki]# vim tls/openssl.cnf 45 dir

= /etc/pki/CA # Where everything is kept 88 countryName = optional 89 stateOrProvinceName = optional 90 organizationName = optional [root@mail CA]# mkdir crl certs netcerts [root@mail CA]# touch index.txt serial [root@mail CA]# echo "01" >serial 創建CA私鑰 [root@mail CA]# openssl genrsa 1024 >private/cakey.pem Generating RSA private key, 1024 bit long modulus .............................................. ........................................ e is 65537 (0x10001) [root@mail CA]# chmod 600 private/* 創建ca證書 [root@mail CA]# openssl req -new -key private/cakey.pem -x509 -out cacert.pem -days 3650 Country Name (2 letter code) [GB]:CN State or Province Name (full name) [Berkshire]:BEIJING Locality Name (eg, city) [Newbury]:BEIJING Organization Name (eg, company) [My Company Ltd]:SECCENTER Organizational Unit Name (eg, section) []:tec Common Name (eg, your name or your server's hostname) []:rootca.net.net Email Address []: 創建鑰匙 [root@mail CA]# cd /etc/mail [root@mail mail]# mkdir certs [root@mail mail]# cd certs/ [root@mail certs]# openssl genrsa 1024 >sendmail.key Generating RSA private key, 1024 bit long modulus ........ ........................... e is 65537 (0x10001) 請求文件 [root@mail certs]# openssl req -new -key sendmail.key -out sendmail.csr Country Name (2 letter code) [GB]:CN State or Province Name (full name) [Berkshire]:HENAN Locality Name (eg, city) [Newbury]:ZHENGZHOU Organization Name (eg, company) [My Company Ltd]:ZZDX Organizational Unit Name (eg, section) []:tec Common Name (eg, your name or your server's hostname) []:mail.bj.com Email Address []: 證書 [root@mail certs]# openssl ca -in sendmail.csr -out sendmail.cert Sign the certificate? [y/n]:y 1 out of 1 certificate requests certified, commit? [y/n]y 編輯sendmail.mc文件 [root@mail mail]# pwd /etc/mail [root@mail mail]# vim sendmail.mc 60 define(`confCACERT_PATH', `/etc/mail/certs')dnl 61 define(`confCACERT', `/etc/mail/certs/cacert.pem')dnl 62 define(`confSERVER_CERT', `/etc/mail/certs/sendmail.cert')dnl 63 define(`confSERVER_KEY', `/etc/mail/certs/sendmail.key')dnl 134 DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl 設置鑰匙許可權 [root@mail certs]# chmod 600 sendmail.key 拷貝cacert.pem到當前目錄下 [root@mail certs]# pwd /etc/mail/certs [root@mail certs]# cp /etc/pki/CA/cacert.pem ./ 重啟sendmail服務 [root@mail mail]# service sendmail restart Shutting down sm-client:

[ OK ] Shutting down sendmail: [ OK ] Starting sendmail: [ OK ] Starting sm-client: [ OK ] 查看一下 [root@mail certs]# telnet 127.0.0.1 25 Trying 127.0.0.1... Connected to mail.bj.com (127.0.0.1). Escape character is '^]'. 220 mail.bj.com ESMTP Sendmail 8.13.8/8.13.8; Fri, 23 Mar 2012 18:17:34 0800 EHLO 127.0.0.1 250-mail.bj.com Hello mail.bj.com [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-STARTTLS 250-DELIVERBY 250 HELP 測試 北京外部郵件客戶機測試 用戶user1選上安全連接ssl

發送郵件和接受郵件時打開日誌監控並打開抓包工具,得到如下信息 [root@mail certs]# tail -f /var/log//maillog Mar 23 19:08:08 mail sendmail[4219]: STARTTLS=server, relay=[192.168.2.3], version=TLSv1/SSLv3, verify=NO, cipher=RC4-MD5, bits=128/128 Mar 23 19:08:08 mail sendmail[4219]: q2NB88dj004219: from=<user1@bj.com>, size=1196, class=0, nrcpts=1, msgid=<B1896E86FE044F089D3715128ED98012@201106201040>, proto=SMTP, daemon=MTA, relay=[192.168.2.3] Mar 23 19:08:09 mail sendmail[4220]: q2NB88dj004219: to=<user1@bj.com>, ctladdr=<user1@bj.com> (500/500), delay=00:00:01, xdelay=00:00:00, mailer=local, pri=31415, dsn=2.0.0, stat=Sent Mar 23 19:08:44 mail dovecot: pop3-login: Login: user=<user1>, method=PLAIN, rip=::ffff:192.168.2.3, lip=::ffff:192.168.2.100 Mar 23 19:08:44 mail dovecot: POP3(user1): Disconnected: Logged out top=0/0, retr=1/1494, del=1/1, size=1477 [root@mail Server]# tshark -ni etho -R "tcp.dsport eq 110" 130.317087 192.168.2.3 -> 192.168.2.100 TCP 2446 > 110 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=3 130.317398 192.168.2.3 -> 192.168.2.100 TCP 2446 > 110 [ACK] Seq=1 Ack=1 Win=372296 Len=0 130.319027 192.168.2.3 -> 192.168.2.100 POP Request: USER user1 130.319511 192.168.2.3 -> 192.168.2.100 POP Request: PASS 123 130.406052 192.168.2.3 -> 192.168.2.100 POP Request: STAT 130.435409 192.168.2.3 -> 192.168.2.100 POP Request: LIST 130.439985 192.168.2.3 -> 192.168.2.100 POP Request: RETR 1 可以看出發送郵件時已經採用ssl進行加密,接受時還是採用明文pop3接受北抓包工具截獲到帳號和密碼 dovecot接收伺服器實現安全接受（pops） 鑰匙請求文件 [root@mail certs]# mkdir -pv /etc/dovecot/certs mkdir: created directory `/etc/dovecot' mkdir: created directory `/etc/dovecot/certs' [root@mail certs]# cd /etc/dovecot/certs/ [root@mail certs]# openssl genrsa 1024 >dovecot.key Generating RSA private key, 1024 bit long modulus .................. ...................... e is 65537 (0x10001) 產生請求 [root@mail certs]# openssl req -new -key dovecot.key -out dovecot.csr Country Name (2 letter code) [GB]:CN State or Province Name (full name) [Berkshire]:HENAN Locality Name (eg, city) [Newbury]:ZHENGZHOU Organization Name (eg, company) [My Company Ltd]:ZZDX Organizational Unit Name (eg, section) []:tec Common Name (eg, your name or your server's hostname) []:pop3.bj.com Email Address []: 請求證書 [root@mail certs]# openssl ca -in dovecot.csr -out dovecot.cert Certificate Details:

Serial Number: 2 (0x2) Validity Not Before: Mar 23 13:04:19 2012 GMT Not After : Mar 23 13:04:19 2013 GMT Subject: countryName = CN stateOrProvinceName = HENAN organizationName = ZZDX organizationalUnitName = tec commonName = pop3.bj.com Sign the certificate? [y/n]:y 1 out of 1 certificate requests certified, commit? [y/n]y 修改許可權 [root@mail certs]# chmod 600 * 編輯dovecot.conf文件 [root@mail certs]# vim /etc/dovecot.conf 21 protocols = imap pop3 imaps 94 ssl_cert_file = /etc/dovecot/certs/dovecot.cert 95 ssl_key_file = /etc/dovecot/certs/dovecot.key 重啟服務 [root@mail certs]# service dovecot restart Stopping Dovecot Imap: [ OK ] Starting Dovecot Imap: [ OK ] 查看運行埠 [root@mail certs]# netstat -tupln |grep dov tcp 0 0 :::993 :::* LISTEN 4328/dovecot tcp 0 0 :::110 :::* LISTEN 4328/dovecot tcp 0 0 :::143 :::* LISTEN 4328/dovecot 測試接受郵件時是否加密

發送和接收郵件時查看到的日誌和抓取到的信息如下 [root@mail certs]# tail -f /var/log/maillog Mar 23 21:52:23 mail sendmail[4377]: STARTTLS=server, relay=[192.168.2.3], version=TLSv1/SSLv3, verify=NO, cipher=RC4-MD5, bits=128/128 Mar 23 21:52:23 mail sendmail[4377]: q2NDqNw5004377: from=<user2@bj.com>, size=1179, class=0, nrcpts=1, msgid=<E198C88DE29A412893A4F7F067040E51@201106201040>, proto=SMTP, daemon=MTA, relay=[192.168.2.3] Mar 23 21:52:23 mail sendmail[4384]: q2NDqNw5004377: to=<user2@bj.com>, ctladdr=<user2@bj.com> (501/501), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31398, dsn=2.0.0, stat=Sent Mar 23 21:52:24 mail dovecot: imap-login: Login: user=<user2>, method=PLAIN, rip=::ffff:192.168.2.3, lip=::ffff:192.168.2.100, TLS [root@mail Server]# tshark -ni eth0 -R "tcp.dstport eq 993" 345.571410 192.168.2.3 -> 192.168.2.100 TCP 3032 > 993 [ACK] Seq=292 Ack=836 Win=371464 Len=0 345.573477 192.168.2.3 -> 192.168.2.100 TLSv1 Application Data 345.574578 192.168.2.3 -> 192.168.2.100 TLSv1 Application Data 345.667520 192.168.2.3 -> 192.168.2.100 TLSv1 Application Data 345.673284 192.168.2.3 -> 192.168.2.100 TLSv1 Application Data 345.674900 192.168.2.3 -> 192.168.2.100 TLSv1 Application Data 可以看出郵件已成功發送和接收並沒有被截獲信息,實現了安全性的收發 郵件證書認證sasl 由於郵件伺服器能夠讓所有用戶發送郵件,這並不安全,為了解決這一現狀,我們採用sasl 是一種雙方通信的規則,是合法帳號才可以發送 環境 [root@mail Server]# rpm -qa |grep sasl cyrus-sasl-lib-2.1.22-5.el5 cyrus-sasl-2.1.22-5.el5 cyrus-sasl-devel-2.1.22-5.el5 cyrus-sasl-plain-2.1.22-5.el5 [root@mail Server]# chkconfig --list |grep sasl saslauthd

0:off 1:off 2:off 3:off 4:off 5:off 6:off 啟動該服務,並設置為開機自動啟動 [root@mail Server]# service saslauthd start Starting saslauthd: [ OK ] [root@mail Server]# chkconfig saslauthd on 編輯sendmail.mc文件 [root@mail Server]# vim /etc/mail/sendmail.mc 39 define(`confAUTH_OPTIONS', `A y')dnl 52 TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl 53 define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl 重啟服務 [root@mail Server]# service sendmail restart Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: [ OK ] Starting sm-client: [ OK ] 查看 [root@mail Server]# telnet 127.0.0.1 Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host: Connection refused [root@mail Server]# telnet 127.0.0.1 25 Trying 127.0.0.1... Connected to mail.bj.com (127.0.0.1). Escape character is '^]'. 220 mail.bj.com ESMTP Sendmail 8.13.8/8.13.8; Fri, 23 Mar 2012 23:24:43 0800 EHLO 127.0.0.1 250-mail.bj.com Hello mail.bj.com [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-AUTH LOGIN PLAIN 250-STARTTLS 250-DELIVERBY 250 HELP 強制驗證 [root@mail Server]# vim /etc/mail/sendmail.mc 116 DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA M=Ea')dnl 重啟服務 [root@mail Server]# service sendmail restart 測試 用客戶機user2給root用戶發送郵件,查看出的日誌如下

編碼帳號：

[root@mail ~]# echo -n "root" |openssl base64 cm9vdA== [root@mail ~]# echo -n "redhat" |openssl base64 cmVkaGF0 [root@mail ~]# telnet 127.0.0.1 25 Trying 127.0.0.1... Connected to mail.bj.com (127.0.0.1). Escape character is '^]'. 220 mail.bj.com ESMTP Sendmail 8.13.8/8.13.8; Sat, 24 Mar 2012 00:25:25 0800 EHLO 127.0.0.1 250-mail.bj.com Hello mail.bj.com [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-AUTH LOGIN PLAIN 250-STARTTLS 250-DELIVERBY 250 HELP AUTH LOGIN cm9vdA== 334 UGFzc3dvcmQ6 cmVkaGF0 235 2.0.0 OK Authenticated MAIL FROM:user2@bj.com

250 2.1.0 user2@bj.com... Sender ok RCPT TO:root@bj.com 250 2.1.5 root@bj.com... Recipient ok DATA 354 Enter mail, end with "." on a line by itself 111111111111111111 . 250 2.0.0 q2NGPPNd003329 Message accepted for delivery

[root@mail certs]# tail -f /var/log//maillog Mar 23 23:39:38 mail dovecot: imap-login: Login: user=<user2>, method=PLAIN, rip=::ffff:192.168.2.3, lip=::ffff:192.168.2.100, TLS Mar 23 23:40:15 mail sendmail[4768]: STARTTLS=server, relay=[192.168.2.3], version=TLSv1/SSLv3, verify=NO, cipher=RC4-MD5, bits=128/128 Mar 23 23:40:15 mail sendmail[4768]: AUTH=server, relay=[192.168.2.3], authid=user2, mech=LOGIN, bits=0 Mar 23 23:40:15 mail sendmail[4768]: q2NFeFoM004768: from=<user2@bj.com>, size=1199, class=0, nrcpts=1, msgid=<81A4F08C96004DC891735E1C529BFAA1@201106201040>, proto=ESMTP, daemon=MTA M=Ea, relay=[192.168.2.3] Mar 23 23:40:15 mail sendmail[4772]: q2NFeFoM004768: to=<root@bj.com>, ctladdr=<user2@bj.com> (501/501), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31442, dsn=2.0.0, stat=Sent Mar 23 23:40:15 mail dovecot: imap-login: Login: user=<user2>, method=PLAIN, rip=::ffff:192.168.2.3, lip=::ffff:192.168.2.100, TLS

sendmail-cf-8.13.8-2.el5.i386.rpm sendmail-doc-8.13.8-2.el5.i386.rpm m4-1.4.5-3.el5.1.i386.rpm（默認已安裝）

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Tags: linux system 系統