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how to Configure Mail Server with Sendmail

Mail Server

Service profile

package:sendmail,sendmail-cf,sendmail-doc

Daemon:/usr/sbin/sendmail

startup script: /etc/init.d/sendmail

port:25

conf file: /etc/mail/sendmail.mc, /etc/aliases, /etc/mail/access, /etc/mail/virtusertable

Installing sendmail

Whether packages are installed or not           #rpm -qa | grep sendmail

Installing sendmail and relevent package        #yum install sendmail sendmail-cf sendmail-doc

Befor editing conf file the task                #hostname

  confirm about hostname and dns:               #hostname station17.example.com     [to user different damain]

                                                #hostname -f

                                                #dig $(hostname -f)

                                                #dig -t mx domainname

  confirm hostname master network:              #vim /etc/sysconfig/network

                                                      NETWORKING=yes

                                                      HOSTNAME=station17.example.com

  check                                         #vim /etc/mail/local-host-name

                                                      ipaddress

                                                      domainname

                                                      fqdn

Edit /etc/mail/sendmail.mc                      #vim /etc/mail/sendmail.mc

                                                      dnl # DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl     [line no 117]

                                                      LOCAL_DOMAIN(`example.com')dnl                                    [line no 155]

To rebuild sendmail.cf                          #m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

                                                #make -C /etc/mail

Initialize service                              #chkconfig sendmail on

Service restart                                 #service sendmail restart

check whether sendmail is working or not        #netstat -ntulp | grep sendmail

Invoke sendmail in debugg mode                  #sendmail -d0 < /dev/null     [to test whether hostname resolving correctly]

Testing sendmail                                #telnet server1.example.com 25

                                                      MAIL from: root@example.com

                                                      rcpt to: susan@example.com

                                                      data

                                                      Hi Every1

                                                      .

                                                      quit

ALIAS

1 Give entry in /etc/aliases                    #vim /etc/aliases

                                                      susan:      shuvo

2 to activate new alias                         #newaliases

VIRUALDOMAIN

1 edit /etc/mail/virtusertable                  #vim /etc/mail/virtusertable

                                                      virtual_domain    original_domain

                                                      virtual_email     original_user

RESTRCITING RELAY

1 by editing /etc/mail/access                   #vim /etc/mail/access

                                                      Domain      action

                                                      From:90trialspammeraol.com    REJECT

                                                      Connect:example.com           RELAY

                                                      Connect:192.168.9       RELAY

2 to effect /etc/mail/access run                #makemap hash /etc/mail/access.db < /etc/mail/access

  following command                             #service sendmail restart

MDA Configure

1 installing dovecot(pop3,pop3s,imap4,imap4s)   #yum install dovecot

                                                #chkconfig dovecot on

                                                #service dovecot start

2 testing dovecot whether its running or not    #netstat -ntulp | grep -i dovecot

3 To enable/disable protocol                    #vim /etc/dovecot

                                                      protocols=imap imaps pop3 pop3s      [uncommnet line, set protocol]

4 Restart service                               #service dovecot restart

5 Send mail using SMTP                          #telnet station17.example.com 25

                                                or

                                                #mutt

                                                      TO:

                                                      SUBJECT:

                                                      SEND (y):

6 Retrieve Mail from  POP3                      #telnet station17.example.com 110   [telnet cmd for pop3]

                                                      user susan        [user]

                                                      pass 123          [pass]

                                                      list              [view list]

                                                      retr              [retrieve]

                                                      quit              [quit]

                                                      dele              [to delete]

SECURE IMAP USING CERTIFICATE

1 install ssl module                            #yum install mod_ssl

2 Create certificate                            #make -C /etc/pki/tls/certs dovecot.pem

3 make entry on /etc/dovecot.conf file          #vim /etc/dovecot.conf

                                                      ssl_cert_file = /etc/pki/tls/certs/dovecot.pem

                                                      ssl_key_file = /etc/pki/tls/certs/dovecot.pem

4 restart the dovecot service                   #service dovecot restart

QUESTION

1 Configure your system as    MTA, Make sure that example.com domain can send your domain

2 Configure your server as POP3 server, Make sure that only example.com domain can access your POP3 service

3 Configure your server as IMAPS, Configure new certificate