{"id":22036,"date":"2017-04-25T09:17:28","date_gmt":"2017-04-25T14:17:28","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=22036"},"modified":"2022-06-03T03:42:12","modified_gmt":"2022-06-03T08:42:12","slug":"how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/","title":{"rendered":"How to set up a mail server with PostfixAdmin on CentOS 7"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p><img decoding=\"async\" class=\"alignnone size-full wp-image-22037\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7.jpg\" alt=\"\" width=\"1200\" height=\"600\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7.jpg 1200w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-150x75.jpg 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-300x150.jpg 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-768x384.jpg 768w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-1024x512.jpg 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-860x430.jpg 860w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-680x340.jpg 680w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-500x250.jpg 500w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-400x200.jpg 400w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-200x100.jpg 200w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2017\/04\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7-50x25.jpg 50w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>In this article, we will show you how to setup and configure a mail server with PostfixAdmin, Postfix, Dovecot and SQLite on a CentOS VPS. PostfixAdmin is a PHP-based web front-end that allows you to manage virtual domains and users for a Postfix mail transport agent. This guide should work on other Linux VPS systems as well but was tested and written for a <a title=\"CentOS VPS Hosting\" href=\"https:\/\/www.rosehosting.com\/centos-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">CentOS 7 VPS<\/a>.<\/p>\n<p>If you use Ubuntu, follow our tutorial to set up <a href=\"https:\/\/www.rosehosting.com\/blog\/setup-and-configure-a-mail-server-with-postfixadmin\/\">Postfix, Dovecot, Spamassassin, SQLite and PostfixAdmin on an Ubuntu 16.04 VPS with Nginx and PHP 7.0<\/a><\/p>\n<p><!--more--><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662cba88a9c8a\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662cba88a9c8a\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#1-Update-the-system-and-install-necessary-packages\" title=\"1. Update the system and install necessary packages\">1. Update the system and install necessary packages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#2-Create-system-user\" title=\"2. Create system user\">2. Create system user<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#3-Install-PostfixAdmin\" title=\"3. Install PostfixAdmin\">3. Install PostfixAdmin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#4-Install-and-configure-postfix\" title=\"4. Install and configure postfix\">4. Install and configure postfix<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#5-Install-and-Configure-Dovecot\" title=\"5. Install and Configure Dovecot\">5. Install and Configure Dovecot<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1-Update-the-system-and-install-necessary-packages\"><\/span>1. Update the system and install necessary packages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<pre>yum update \r\nyum install wget nano sqlite<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"2-Create-system-user\"><\/span>2. Create system user<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For security reasons, we will create a new system user who will be the owner of all mailboxes.<\/p>\n<pre>useradd -r -u 150 -g mail -d \/var\/vmail -s \/sbin\/nologin -c \"Virtual Mail User\" vmail\r\nmkdir -p \/var\/vmail\r\nchmod -R 770 \/var\/vmail\r\nchown -R vmail:mail \/var\/vmail\r\n<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"3-Install-PostfixAdmin\"><\/span>3. Install PostfixAdmin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The latest version of PostfixAdmin, version 3, supports <a href=\"https:\/\/www.rosehosting.com\/mysql-hosting.html\">MySQL<\/a>, <a href=\"https:\/\/www.rosehosting.com\/postgresql-hosting.html\">PostgreSQL<\/a>, and SQLite databases. In this guide, we will use SQLite.<br \/>\nDownload the PostfixAdmin archive from SourceForge and extract it in the \/var\/www\/html\/ directory:<\/p>\n<pre>wget -q -O - \"http:\/\/downloads.sourceforge.net\/project\/postfixadmin\/postfixadmin\/postfixadmin-3.0.2.2\/postfixadmin-3.0.2.2.tar.gz\" | tar -xzf - -C \/var\/www\/html<\/pre>\n<p>Open the mail configuration file and edit the following values:<\/p>\n<pre>nano \/var\/www\/html\/postfixadmin-3.0.2\/config.inc.php<\/pre>\n<pre>$CONF['configured'] = true;\r\n$CONF['database_type'] = 'sqlite';\r\n\/\/ $CONF['database_host'] = 'localhost';\r\n\/\/ $CONF['database_user'] = 'postfix';\r\n\/\/ $CONF['database_password'] = 'postfixadmin';\r\n$CONF['database_name'] = '\/var\/vmail\/postfixadmin.db';\r\n\r\n$CONF['domain_path'] = 'NO';\r\n$CONF['domain_in_mailbox'] = 'YES';\r\n<\/pre>\n<pre>chown -R apache: \/var\/www\/html\/postfixadmin-3.0.2<\/pre>\n<p>Create the SQLite database:<\/p>\n<pre>touch \/var\/vmail\/postfixadmin.db\r\nchown vmail:mail \/var\/vmail\/postfixadmin.db\r\nchmod 660 \/var\/vmail\/postfixadmin.db\r\nusermod -a -G mail apache<\/pre>\n<p>To populate the database go to <code>https:\/\/Your_IP_Address\/postfixadmin-3.0.2\/setup.php<\/code> and you should see something like below:<br \/>\n<code>Testing database connection - OK - sqlite:\/\/:xxxxx@\/\/var\/vmail\/postfixadmin.db<br \/>\nEverything seems fine... attempting to create\/update database structure<\/code><\/p>\n<p>Create a new admin user:<\/p>\n<pre>bash \/var\/www\/html\/postfixadmin-3.0.2\/scripts\/postfixadmin-cli admin add admin@your_domain_name.com --password strong_password22 --password2 strong_password22 --superadmin 1 --active 1\r\n<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"4-Install-and-configure-postfix\"><\/span>4. Install and configure postfix<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Postfix version 3 is not available in the default CentOS 7 repository so we will use the GhettoForge repository:<\/p>\n<pre>rpm -Uhv http:\/\/mirror.ghettoforge.org\/distributions\/gf\/gf-release-latest.gf.el7.noarch.rpm<\/pre>\n<p>Install postfix3 with SQLite support with the command bellow:<\/p>\n<pre>yum install postfix3 postfix3-sqlite --enablerepo=gf-plus<\/pre>\n<p><span class=\"st\">Once the installation is completed, c<\/span>reate the following files:<\/p>\n<pre>nano \/etc\/postfix\/sqlite_virtual_alias_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery = SELECT goto FROM alias WHERE address='%s' AND active = '1'<\/pre>\n<pre>nano \/etc\/postfix\/sqlite_virtual_alias_domain_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = '%u' || '@' || alias_domain.target_domain AND alias.active = 1 AND alias_domain.active='1'<\/pre>\n<pre>nano \/etc\/postfix\/sqlite_virtual_alias_domain_catchall_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery  = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = '@' || alias_domain.target_domain AND alias.active = 1 AND alias_domain.active='1'<\/pre>\n<pre>nano \/etc\/postfix\/sqlite_virtual_domains_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery = SELECT domain FROM domain WHERE domain='%s' AND active = '1'<\/pre>\n<pre>nano \/etc\/postfix\/sqlite_virtual_mailbox_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'<\/pre>\n<pre>nano \/etc\/postfix\/sqlite_virtual_alias_domain_mailbox_maps.cf<\/pre>\n<pre>dbpath = \/var\/vmail\/postfixadmin.db\r\nquery = SELECT maildir FROM mailbox,alias_domain WHERE alias_domain.alias_domain = '%d' and mailbox.username = '%u' || '@' || alias_domain.target_domain AND mailbox.active = 1 AND alias_domain.active='1'<\/pre>\n<p>[ecko_alert color=&#8221;blue&#8221;]Stuck somewhere? <a href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting.html\">Get a VPS<\/a> from us and we&#8217;ll do all of this for you, free of charge! We&#8217;ll completely set up and configure a mail server for you. [\/ecko_alert]<\/p>\n<p>Edit the <code>main.cf<\/code> file:<\/p>\n<pre>postconf -e \"myhostname = $(hostname -f)\"\r\n \r\npostconf -e \"virtual_mailbox_domains = sqlite:\/etc\/postfix\/sqlite_virtual_domains_maps.cf\"\r\npostconf -e \"virtual_alias_maps =  sqlite:\/etc\/postfix\/sqlite_virtual_alias_maps.cf, sqlite:\/etc\/postfix\/sqlite_virtual_alias_domain_maps.cf, sqlite:\/etc\/postfix\/sqlite_virtual_alias_domain_catchall_maps.cf\"\r\npostconf -e \"virtual_mailbox_maps = sqlite:\/etc\/postfix\/sqlite_virtual_mailbox_maps.cf, sqlite:\/etc\/postfix\/sqlite_virtual_alias_domain_mailbox_maps.cf\"\r\n \r\npostconf -e \"smtpd_tls_cert_file = \/etc\/pki\/tls\/certs\/localhost.crt\"\r\npostconf -e \"smtpd_tls_key_file = \/etc\/pki\/tls\/private\/localhost.key\"\r\npostconf -e \"smtpd_use_tls = yes\"\r\npostconf -e \"smtpd_tls_auth_only = yes\"\r\n \r\npostconf -e \"smtpd_sasl_type = dovecot\"\r\npostconf -e \"smtpd_sasl_path = private\/auth\"\r\npostconf -e \"smtpd_sasl_auth_enable = yes\"\r\npostconf -e \"smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination\"\r\n \r\npostconf -e \"mydestination = localhost\"\r\npostconf -e \"mynetworks = 127.0.0.0\/8\"\r\npostconf -e \"inet_protocols = ipv4\"\r\npostconf -e \"inet_interfaces = all\"\r\n\r\npostconf -e \"virtual_transport = lmtp:unix:private\/dovecot-lmtp\"\r\n<\/pre>\n<p>Open the <code> master.cf<\/code> file, find <code>submission inet n<\/code> and <code>smtps inet n<\/code> sections and edit as follows:<\/p>\n<pre>nano \/etc\/postfix\/master.cf<\/pre>\n<pre>submission inet n       -       n       -       -       smtpd\r\n  -o syslog_name=postfix\/submission\r\n  -o smtpd_tls_security_level=encrypt\r\n  -o smtpd_sasl_auth_enable=yes\r\n#  -o smtpd_reject_unlisted_recipient=no\r\n#  -o smtpd_client_restrictions=$mua_client_restrictions\r\n#  -o smtpd_helo_restrictions=$mua_helo_restrictions\r\n#  -o smtpd_sender_restrictions=$mua_sender_restrictions\r\n#  -o smtpd_recipient_restrictions=\r\n  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject\r\n  -o milter_macro_daemon_name=ORIGINATING\r\nsmtps     inet  n       -       n       -       -       smtpd\r\n  -o syslog_name=postfix\/smtps\r\n#  -o smtpd_tls_wrappermode=yes\r\n  -o smtpd_sasl_auth_enable=yes\r\n#  -o smtpd_reject_unlisted_recipient=no\r\n#  -o smtpd_client_restrictions=$mua_client_restrictions\r\n#  -o smtpd_helo_restrictions=$mua_helo_restrictions\r\n#  -o smtpd_sender_restrictions=$mua_sender_restrictions\r\n#  -o smtpd_recipient_restrictions=\r\n  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject\r\n  -o milter_macro_daemon_name=ORIGINATING\r\n\r\n<\/pre>\n<p>Enable and restart the postfix service<\/p>\n<pre>systemctl enable postfix\r\nsystemctl restart postfix\r\n<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"5-Install-and-Configure-Dovecot\"><\/span>5. Install and Configure Dovecot<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Install dovecot using the command bellow:<\/p>\n<pre>yum install dovecot<\/pre>\n<p>Open the <code>\/etc\/dovecot\/conf.d\/10-mail.conf<\/code> file and change the following values:<\/p>\n<pre><code>nano \/etc\/dovecot\/conf.d\/10-mail.conf<\/code><\/pre>\n<pre>mail_location = maildir:\/var\/vmail\/%d\/%n\r\nmail_privileged_group = mail\r\nmail_uid = vmail\r\nmail_gid = mail\r\nfirst_valid_uid = 150\r\nlast_valid_uid = 150\r\n<\/pre>\n<p>Open the <code>\/etc\/dovecot\/conf.d\/10-auth.conf<\/code> file and change the following values:<\/p>\n<pre><code>nano \/etc\/dovecot\/conf.d\/10-auth.conf<\/code><\/pre>\n<pre>auth_mechanisms = plain login\r\n#!include auth-system.conf.ext\r\n!include auth-sql.conf.ext\r\n<\/pre>\n<p>Create a new <code>dovecot-sql.conf.ext<\/code> file:<\/p>\n<pre>nano \/etc\/dovecot\/dovecot-sql.conf.ext<\/pre>\n<pre>driver = sqlite\r\nconnect = \/var\/vmail\/postfixadmin.db\r\ndefault_pass_scheme = MD5-CRYPT\r\npassword_query = \\\r\n  SELECT username as user, password, '\/var\/vmail\/%d\/%n' as userdb_home, \\\r\n  'maildir:\/var\/vmail\/%d\/%n' as userdb_mail, 150 as userdb_uid, 8 as userdb_gid \\\r\n  FROM mailbox WHERE username = '%u' AND active = '1'\r\nuser_query = \\\r\n  SELECT '\/var\/vmail\/%d\/%n' as home, 'maildir:\/var\/vmail\/%d\/%n' as mail, \\\r\n  150 AS uid, 8 AS gid, 'dirsize:storage=' || quota AS quota \\\r\n  FROM mailbox WHERE username = '%u' AND active = '1'\r\n<\/pre>\n<p>In the <code>\/etc\/dovecot\/conf.d\/10-ssl.conf<\/code> file enable SSL support:<\/p>\n<pre>ssl = yes<\/pre>\n<p>Open the <code>\/etc\/dovecot\/conf.d\/15-lda.conf<\/code> file and set the <code>postmaster_address<\/code> email address.<\/p>\n<pre>postmaster_address = postmaster@your_domain_name.com<\/pre>\n<p>Open the <code>\/etc\/dovecot\/conf.d\/10-master.conf<\/code> file, find the service lmtp section and change it to:<\/p>\n<pre>service lmtp {\r\n  unix_listener \/var\/spool\/postfix\/private\/dovecot-lmtp {\r\n    mode = 0600\r\n    user = postfix\r\n    group = postfix\r\n  }\r\n}\r\n<\/pre>\n<p>find the service auth section and change it to:<\/p>\n<pre>service auth {\r\n  unix_listener \/var\/spool\/postfix\/private\/auth {\r\n    mode = 0666\r\n    user = postfix\r\n    group = postfix\r\n  }\r\n  unix_listener auth-userdb {\r\n    mode = 0600\r\n    user = vmail\r\n    #group = vmail\r\n  }\r\n  user = dovecot\r\n}\r\n<\/pre>\n<p>Change the service auth-worker section to the following:<\/p>\n<pre>service auth-worker {\r\n  user = vmail\r\n}<\/pre>\n<p>Set the permissions:<\/p>\n<pre>chown -R vmail:dovecot \/etc\/dovecot\r\nchmod -R o-rwx \/etc\/dovecot<\/pre>\n<p>Enable and restart the dovecot service<\/p>\n<pre>systemctl enable dovecot \r\nsystemctl restart dovecot \r\n<\/pre>\n<hr \/>\n<p>If everything is setup correctly now you should be able to log in to your PostfixAdmin backend by going to <code>http:\/\/Your_IP_Address\/postfixadmin-3.0.2.2<\/code> and create your first virtual domain and mailbox.<\/p>\n<hr \/>\n<p>Of course, you don\u2019t have to\u00a0set up a mail server with PostfixAdmin on CentOS 7, if you use one of our <a title=\"linux vps hosting\" href=\"https:\/\/www.rosehosting.com\/email-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">Mail Server Hosting<\/a> services, in which case you can simply ask our expert Linux admins to setup this for you. They are available 24&#215;7 and will take care of your request immediately.<\/p>\n<p><span style=\"color: #ff0000;\"><strong>PS<\/strong><\/span>. If you liked this post please share it with your friends on the social networks using the buttons below or simply leave a comment in the Comments Section below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we will show you how to setup and configure a mail server with PostfixAdmin, Postfix, Dovecot and &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to set up a mail server with PostfixAdmin on CentOS 7\" class=\"read-more button\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-a-mail-server-with-postfixadmin-on-centos-7\/#more-22036\" aria-label=\"Read more about How to set up a mail server with PostfixAdmin on CentOS 7\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":22037,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1699,1706],"tags":[71,15,220,1471],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to set up a mail server with PostfixAdmin on CentOS 7 - RoseHosting<\/title>\n<meta name=\"description\" content=\"How to set up a mail server with PostfixAdmin on CentOS 7 - 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