mail server
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The document provides instructions for installing and configuring a mail server on a Linux system using Postfix for SMTP, Dovecot for IMAP/POP3, and SquirrelMail for webmail. It involves installing packages, configuring files like main.cf and dovecot.conf, creating users, enabling services at startup, and testing connections via telnet and a web browser. The goal is to set up a full-featured mail server for receiving, accessing, and managing email.
![MAIL SERVER INSTALLATION & CONFIGARATION
» Installing and configuring postfix
Step 1 »Before installation assign a static ip and add a host entry for your domain to that IP in the /etc/hosts file like below.
192.168.0.15 dblgroup.com
Step 2 » Issue the below command to install postfix.
[root@mail ~]# yum -y install postfix
Step 3 » Now issue the below command to install SMTP AUTH packages .
[root@mail ~]# yum -y install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi
cyrus-sasl-md5 cyrus-sasl-plain
Postfix package installation is completed .
Step 4 » Issue the below commands one by one for creating SSL Cert.
[root@mail ~]# mkdir /etc/postfix/ssl
[root@mail ~]# cd /etc/postfix/ssl/
[root@mail ssl]# openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024
[root@mail ssl]# chmod 600 smtpd.key
[root@mail ssl]# openssl req -new -key smtpd.key -out smtpd.csr
[root@mail ssl]# openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out
smtpd.crt
[root@mail ssl]# openssl rsa -in smtpd.key -out smtpd.key.unencrypted
[root@mail ssl]# mv -f smtpd.key.unencrypted smtpd.key
[root@mail ssl]# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out
cacert.pem -days 365
Step 4 » Now open /etc/postfix/main.cf file .
Find and comment the below lines .
#inet_interfaces = localhost #---> line no 116
#mydestination = $myhostname, localhost.$mydomain, localhost #--> line no 164
and add these lines at the bottom of the file.
myhostname = mail.dblgroup.com
mydomain = dblgroup.com
myorigin = $mydomain
home_mailbox = mail/
mynetworks = 127.0.0.0/8
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = cyrus
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom](https://image.slidesharecdn.com/3c5559a8-541e-44b1-a7e0-03fbff12a65d-161018054928/85/mail-server-1-320.jpg)
![Step 5 » Now open /etc/postfix/master.cf file and add the below line after smtp
smtps inet n - n - - smtpd
-o smtpd_sasl_auth_enable=yes
-o smtpd_reject_unlisted_sender=yes
-o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
-o broken_sasl_auth_clients=yes
Step 6 » Now start postfix and saslauthd service
[root@mail ~]# service postfix start
[root@mail ~]# service saslauthd start
» Issue the below commands to start the postfix and saslauthd at startup
[root@mail ~]# chkconfig --level 235 postfix on
[root@mail ~]# chkconfig --level 235 saslauthd on
Step 7 » Now check your smtp connectivity . just telnet localhost on port 25 and type this command ehlo localhost
[root@mail ~]# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 mail.dblgroup.com ESMTP Postfixehlo localhost <---- type this command 250-
mail.krizna.com250-PIPELINING250-SIZE 10240000250-VRFY250-ETRN250-STARTTLS
250-AUTH PLAIN LOGIN250-AUTH=PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME
250 DSNquit221 2.0.0 ByeConnection closed by foreign host.
If you get this output .. Great .. everything is fine till now.
» Installing and configuring dovecot
Step 8 » Issue this command to install dovecot
[root@mail ~]# yum -y install dovecot
Step 9 » After installation open /etc/dovecot/dovecot.conf file and add the below line at the end of the file. please make sure
mail_location and home_mailbox in postfix configuration are using the same name.
protocols = imap pop3
mail_location = maildir:~/mail
pop3_uidl_format = %08Xu%08Xv
Step 10 » Now start dovecot service
[root@mail ~]# service dovecot start
» Issue the below command to start the dovecot at startup
[root@mail ~]# chkconfig --level 235 dovecot on
Step 11 » Now test your pop3 connectivity .](https://image.slidesharecdn.com/3c5559a8-541e-44b1-a7e0-03fbff12a65d-161018054928/85/mail-server-2-320.jpg)
![[root@mail ~]# telnet localhost 110
Trying ::1...
Connected to localhost.
Escape character is '^]'.
+OK Dovecot ready.
quit
+OK Logging out
Connection closed by foreign host.
Yes .. your server is ready to receive mails .
» Creating users and testing
Step 11 » Now create users to test your configuration.
[root@mail ~]# useradd -m chacheng -s /sbin/nologin
[root@mail ~]# useradd -m motin -s /sbin/nologin
and create passwords for the users created
[root@mail ~]# passwd chacheng
[root@mail ~]# passwd motin
» Installing and configuring squirrelmail
Step 12 » you need to add EPEL repository to install squirrelmail package. you can find latest EPEL repository rpm here
( http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/repoview/epel-release.html )
[root@mail ~]# rpm -ivh
http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/epel-release-6-8.noarch.rpm
Step 13 » Issue the below command to install squirrelmail.
[root@mail ~]# yum install squirrelmail
This command will install squirrelmail along with apache and php.
Step 14 » Now run the below command to configure squirrelmail .
[root@mail ~]# perl /usr/share/squirrelmail/config/conf.pl
»»» 1 »»» 1 »»» krizna (type Organization name ) »»» R ( return )
»»» 2 »»» 1 »»» ( hit space for empty Domain name ) and choose 3 »»» SMTP ( choose SMTP ) »»» R ( return )
»»» D »»» dovecot ( type ) »»» press enter with default
»»» s ( save and quit)
Step 15 » Open /etc/httpd/conf.d/squirrelmail.conf file and uncomment below lines
# RewriteCond %{HTTPS} !=on
# RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
Step 16 » start apache service
[root@mail ~]# service httpd start
» Issue the below commands to start the httpd at startup
[root@mail ~]# chkconfig --level 235 httpd on
Step 17 » Now open http://serverip/webmail path in your browser . you could able to see the below page .
Login any problem or Error connecting to IMAP Server localhost
13. permission denied.
Then
[root@mail ~]# setsebool -P httpd_can_network_connect=1
[root@mail ~]# service httpd restart](https://image.slidesharecdn.com/3c5559a8-541e-44b1-a7e0-03fbff12a65d-161018054928/85/mail-server-3-320.jpg)
mail server
- 1. MAIL SERVER INSTALLATION & CONFIGARATION » Installing and configuring postfix Step 1 »Before installation assign a static ip and add a host entry for your domain to that IP in the /etc/hosts file like below. 192.168.0.15 dblgroup.com Step 2 » Issue the below command to install postfix. [root@mail ~]# yum -y install postfix Step 3 » Now issue the below command to install SMTP AUTH packages . [root@mail ~]# yum -y install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain Postfix package installation is completed . Step 4 » Issue the below commands one by one for creating SSL Cert. [root@mail ~]# mkdir /etc/postfix/ssl [root@mail ~]# cd /etc/postfix/ssl/ [root@mail ssl]# openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024 [root@mail ssl]# chmod 600 smtpd.key [root@mail ssl]# openssl req -new -key smtpd.key -out smtpd.csr [root@mail ssl]# openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out smtpd.crt [root@mail ssl]# openssl rsa -in smtpd.key -out smtpd.key.unencrypted [root@mail ssl]# mv -f smtpd.key.unencrypted smtpd.key [root@mail ssl]# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 365 Step 4 » Now open /etc/postfix/main.cf file . Find and comment the below lines . #inet_interfaces = localhost #---> line no 116 #mydestination = $myhostname, localhost.$mydomain, localhost #--> line no 164 and add these lines at the bottom of the file. myhostname = mail.dblgroup.com mydomain = dblgroup.com myorigin = $mydomain home_mailbox = mail/ mynetworks = 127.0.0.0/8 inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain smtpd_sasl_auth_enable = yes smtpd_sasl_type = cyrus smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_tls_auth_only = no smtp_use_tls = yes smtpd_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom
- 2. Step 5 » Now open /etc/postfix/master.cf file and add the below line after smtp smtps inet n - n - - smtpd -o smtpd_sasl_auth_enable=yes -o smtpd_reject_unlisted_sender=yes -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject -o broken_sasl_auth_clients=yes Step 6 » Now start postfix and saslauthd service [root@mail ~]# service postfix start [root@mail ~]# service saslauthd start » Issue the below commands to start the postfix and saslauthd at startup [root@mail ~]# chkconfig --level 235 postfix on [root@mail ~]# chkconfig --level 235 saslauthd on Step 7 » Now check your smtp connectivity . just telnet localhost on port 25 and type this command ehlo localhost [root@mail ~]# telnet localhost 25 Trying ::1... Connected to localhost. Escape character is '^]'. 220 mail.dblgroup.com ESMTP Postfixehlo localhost <---- type this command 250- mail.krizna.com250-PIPELINING250-SIZE 10240000250-VRFY250-ETRN250-STARTTLS 250-AUTH PLAIN LOGIN250-AUTH=PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME 250 DSNquit221 2.0.0 ByeConnection closed by foreign host. If you get this output .. Great .. everything is fine till now. » Installing and configuring dovecot Step 8 » Issue this command to install dovecot [root@mail ~]# yum -y install dovecot Step 9 » After installation open /etc/dovecot/dovecot.conf file and add the below line at the end of the file. please make sure mail_location and home_mailbox in postfix configuration are using the same name. protocols = imap pop3 mail_location = maildir:~/mail pop3_uidl_format = %08Xu%08Xv Step 10 » Now start dovecot service [root@mail ~]# service dovecot start » Issue the below command to start the dovecot at startup [root@mail ~]# chkconfig --level 235 dovecot on Step 11 » Now test your pop3 connectivity .
- 3. [root@mail ~]# telnet localhost 110 Trying ::1... Connected to localhost. Escape character is '^]'. +OK Dovecot ready. quit +OK Logging out Connection closed by foreign host. Yes .. your server is ready to receive mails . » Creating users and testing Step 11 » Now create users to test your configuration. [root@mail ~]# useradd -m chacheng -s /sbin/nologin [root@mail ~]# useradd -m motin -s /sbin/nologin and create passwords for the users created [root@mail ~]# passwd chacheng [root@mail ~]# passwd motin » Installing and configuring squirrelmail Step 12 » you need to add EPEL repository to install squirrelmail package. you can find latest EPEL repository rpm here ( http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/repoview/epel-release.html ) [root@mail ~]# rpm -ivh http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/epel-release-6-8.noarch.rpm Step 13 » Issue the below command to install squirrelmail. [root@mail ~]# yum install squirrelmail This command will install squirrelmail along with apache and php. Step 14 » Now run the below command to configure squirrelmail . [root@mail ~]# perl /usr/share/squirrelmail/config/conf.pl »»» 1 »»» 1 »»» krizna (type Organization name ) »»» R ( return ) »»» 2 »»» 1 »»» ( hit space for empty Domain name ) and choose 3 »»» SMTP ( choose SMTP ) »»» R ( return ) »»» D »»» dovecot ( type ) »»» press enter with default »»» s ( save and quit) Step 15 » Open /etc/httpd/conf.d/squirrelmail.conf file and uncomment below lines # RewriteCond %{HTTPS} !=on # RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} Step 16 » start apache service [root@mail ~]# service httpd start » Issue the below commands to start the httpd at startup [root@mail ~]# chkconfig --level 235 httpd on Step 17 » Now open http://serverip/webmail path in your browser . you could able to see the below page . Login any problem or Error connecting to IMAP Server localhost 13. permission denied. Then [root@mail ~]# setsebool -P httpd_can_network_connect=1 [root@mail ~]# service httpd restart
- 4. BACKUP FILE LOCATION: 1. cp /etc/hosts 2. cp /etc/postfix/main.cf 3. cp /etc/postfix/master.cf 4. cp /etc/dovecot/dovecot.conf 5. cp /etc/passwd