Mail Server Setup using Sendmail on CentOS 5.8 Jeong Chul tland12.wordpress.com Computer Science ITC and RUPP in Cambodia

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Dominic Caldwell
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1 Mail Server Setup using Sendmail on CentOS 5.8 Jeong Chul tland12.wordpress.com Computer Science ITC and RUPP in Cambodia

2 Mail Server Setup using Sendmail on CentOS 5.8 Part 1 Step 1 Service Step 2 Essential Operation Step 3 Package installation and Startup Step 4 Sendmail Configuration 1, 2 Part 2 Step 5 Inbound Sendmail Aliases Step 6 Sendmail.cf file Step 7 Sendmail Operation Step 8 IMAP and POP3 on Dovecot Step 9 MUA Configuration

3 Mail Server Testing Environment 1.sever.chul.com: Sendmail Mail server (mail.chul.com) Evolution for MUA 2.client.chul.com: Linux mail client Thunderbird for MUA 3.Windows 7 : Windows mail client Outlook 2010 for MUA

4 Step 1 Service System Components 1.Mail User Agent (MUA): A client used to compose and read (Outlook, Evolution, Thunderbird, Mutt) 2.Mail Transfer Agent (MTA): An SMTP server used to relay or accept for delivery (Postfix, Sendmail, Exim, Qmail, Exchange server) 3.Mail Delivery Agent (MDA): A program used by the final MTA to deliver to the message store May be included with the MTA or a separate program such as procmail 4.Mail Access Agent (MAA): An IMAP/POP3 server used by an MUA to access the message store (Dovecot, Cyrus IMAP)

5 Step 2 Essential Operation

6 1.Package installation sendmail-cf el5_7 sendmail-doc el5_7 sendmail el5_7 sendmail-devel el5_7 Step 3 Installation and startup 2. Service startup and main directory # service sendmail start # ls l /etc/mail/ 3. Service startup checking # ps ef grep sendmail # netstat nat grep Runlevel registration # chkconfig sendmail on # chkconfig list sendmail 5. Testing on command # telnet localhost 25 # mail v s title linux@chul.com < /etc/passwd

7 Step 4 Sendmail Configuration (1) 1.Introduction to Sendmail Configuration /etc/mail/sendmail.mc and /etc/mail/sendmail.cf # m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf "dnl " at the start of a line is a comment in /etc/mail/sendmail.mc 2. # service sendmail restart automatically builds configuration files Converts /etc/mail/sendmail.mc into /etc/mail/sendmail.cf 3. Incoming Sendmail configuration /etc/mail/sendmail.mc dnl dnl DAEMON_OPTIONS(`Port=smtp,Addr= , Name=MTA')dnl /etc/mail/local-host-names 1 mail.chul.com 2 chul.com 3 jeong.net Add a line for each domain/host for which we accept local delivery

8 Step 4 Sendmail Configuration (2) 4. Outgoing Sendmail configuration To relay sent by hosts on your internal network dnl DAEMON_OPTIONS(`Port=smtp,Addr= , Name=MTA') dnl /etc/mail/access : each internal network or host for which the server will relay Connect: RELAY Connect: RELAY Connect: chul.com RELAY Connect: spam.net REJECT To: root@jeong.com ERROR:550 bad name From: spam@example.com REJECT 5. Sendmail: Masquerading in /etc/mail/sendmail.mc EXPOSED_USER(`root')dnl MASQUERADE_AS(`chul.com')dnl FEATURE(masquerade_envelope)dnl FEATURE(masquerade_entire_domain)dnl MASQUERADE_DOMAIN(chul.com)dnl # service sendmail restart

9 Step 5 Inbound Sendmail Aliases 1.Local aliases: /etc/aliases Local mail forwarding fakename: realname root: tland,linux,song,park,jeong staff: :include /home/staff/staff_list Mailing List 2. Virtual aliases: /etc/mail/virtusertable admin@example.com user1 admin@chul.com user2 pack@itjeong.com %1@dom2.org //same user different domain

10 1. Name for error message DnMAILER-DAEMON Step 6 Sendmail.cf file 2. Version Number for security DZ O SmtpGreetingMessage=$j Sendmail $v/$z; $b // j: hostname v&z: version b: timestamp //if want, change 3. Max Message Size (byte) O MaxMessageSize= Max hop Count O MaxHopCount=17 //2 Mb // Max mail server for routing 5. Queue directory for sending and receiving temporarily O QueueDirectory=/var/spool/mqueue 6. Minimum time in queue before retry O MinQueueAge=30m

11 1./etc/mail/local-host-names must contain server's name and aliases 2.# mail -v user view SMTP exchange with local relay Step 7 Sendmail Operation 3.# mailq and mailq -Ac view messages queued for future delivery 4.# sendmail q reprocess the queue 5.# tail -f /var/log/maillog view log in real-time

12 Step 8 IMAP and POP3 on Dovecot 1.Dovecot supports POP3, POP3s, IMAP, andimaps 2. Installation and startup # yum install dovecot # vi /etc/dovecot.conf protocols = imap imaps pop3 pop3s # service dovecot start 3.Service startup checking # ps ef grep dovecot # netstat nat grep 110, Runlevel registration # chkconfig dovecot on # chkconfig list dovecot 5. Testing on command # telnet localhost 110 //pop3 # telnet localhost 143 //imap

13 Step 9 MUA Configuration 1.Graphical: Evolution on Sever system # yum install evolution Thunderbird on Client system of Linux # yum install thunderbird Outlook 2010 on Client system of Windows 7 2.Text-mode: Mutt and Fetchmail mutt -f pop://user@server mutt -f pops://user@server

14 1.How to setup Postfix 2.How to setup qmail 3.How to setup Exim 4. server security Assignment

15 Mail Server Setup using Sendmail on CentOS 5.8 Thank you!! See you again on Https, next video tland12.wordpress.com

This material is based on work supported by the National Science Foundation under Grant No

This material is based on work supported by the National Science Foundation under Grant No. 0802551 Any opinions, findings, and conclusions or recommendations expressed in this material are those of the