{"id":5176,"date":"2014-10-15T13:32:59","date_gmt":"2014-10-15T18:32:59","guid":{"rendered":"https:\/\/secure.rosehosting.com\/blog\/?p=5176"},"modified":"2022-12-08T06:26:45","modified_gmt":"2022-12-08T12:26:45","slug":"how-to-install-and-configure-dkim-with-opendkim-and-exim-on-a-centos-7-vps","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-install-and-configure-dkim-with-opendkim-and-exim-on-a-centos-7-vps\/","title":{"rendered":"How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p><img decoding=\"async\" class=\"alignleft wp-image-2966\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2013\/12\/how-to-install-and-integrate-opendkim-with-postfix-on-a-centos-6-vps.jpg\" alt=\"how-to-install-and-integrate-opendkim-with-postfix-on-a-centos-6-vps\" width=\"400\" height=\"234\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2013\/12\/how-to-install-and-integrate-opendkim-with-postfix-on-a-centos-6-vps.jpg 480w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2013\/12\/how-to-install-and-integrate-opendkim-with-postfix-on-a-centos-6-vps-300x175.jpg 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/>In this article we will walk you through the steps of <strong>installing and configuring dkim with OpenDKIM and Exim on a CentOS 7 <a title=\"SSD VPS\" href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">SSD VPS<\/a><\/strong>.<\/p>\n<p>You should have a working <a title=\"Mail Servers\" href=\"https:\/\/www.rosehosting.com\/blog\/search\/mail+server\" target=\"_blank\" rel=\"noopener noreferrer\">mail server<\/a> setup with <strong>Exim<\/strong> before proceeding with this tutorial. Check our guide on <a title=\"Set-up a mailserver with Exim and Dovecot on a CentOS 7 VPS\" href=\"https:\/\/www.rosehosting.com\/blog\/setup-a-mailserver-with-exim-and-dovecot-on-a-centos-7-vps\/\" target=\"_blank\" rel=\"noopener noreferrer\">how to set-up a mail server with Exim and Dovecot on a CentOS 7 VPS<\/a> if you don&#8217;t have setup a mail server yet.<\/p>\n<p><strong>What is OpenDKIM?<\/strong><\/p>\n<p><a title=\"OpenDKIM\" href=\"https:\/\/www.rosehosting.com\/blog\/search\/opendkim\" target=\"_blank\" rel=\"noopener noreferrer\">OpenDKIM<\/a> is an open source implementation of the DKIM (<strong>Domain Keys Identified Mail<\/strong>) sender authentication system which is an email validation system <strong>designed to detect email spoofing<\/strong> by providing a mechanism to allow receiving mail exchangers to <strong>check that incoming mail from a domain is authorized<\/strong> by that domain&#8217;s administrators. A <strong>digital signature<\/strong> included with the message <strong>can be validated<\/strong> by the recipient using the signer&#8217;s public key published in the DNS.<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<h4><b>UPDATE THE SYSTEM<\/b><\/h4>\n<p>Before you start with the installation of <strong>OpenDKIM<\/strong>, <code>ssh<\/code> to your server and initiate a <code>screen<\/code> session using the command below:<\/p>\n<pre>## screen -U -S exim-opendkim<\/pre>\n<p>once you&#8217;re in a <code>screen<\/code> session, update your <a title=\"CentOS VPS\" href=\"https:\/\/www.rosehosting.com\/centos-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">CentOS 7 VPS<\/a> using <code>yum<\/code> as in:<\/p>\n<pre>## yum update<\/pre>\n<p>&nbsp;<\/p>\n<h4><b>INSTALL SOME PACKAGES<\/b><\/h4>\n<pre>## yum install curl wget vim openssl man<\/pre>\n<p>&nbsp;<\/p>\n<h4><b>ENABLE EPEL REPOSITORY<\/b><\/h4>\n<p>OpenDKIM is available in the EPEL (Extra Packages for Enterprise Linux) repositry, so let&#8217;s enable EPEL repository on the <a title=\"CentOS SSD VPS\" href=\"https:\/\/www.rosehosting.com\/centos-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">CentOS VPS<\/a> using:<\/p>\n<pre>## yum install http:\/\/dl.fedoraproject.org\/pub\/epel\/7\/x86_64\/e\/epel-release-7-2.noarch.rpm<\/pre>\n<p><em>if you get a 404 not found, go at <a href=\"https:\/\/dl.fedoraproject.org\/pub\/epel\/7\/x86_64\/Packages\/e\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/dl.fedoraproject.org\/pub\/epel\/7\/x86_64\/Packages\/e\/<\/a> and install the latest <code>epel-release<\/code> rpm package available.<\/em><\/p>\n<p>next, check if EPEL has been enabled on your system using:<\/p>\n<pre>## yum repolist<\/pre>\n<p>&nbsp;<\/p>\n<h4><b>INSTALL OPENDKIM<\/b><\/h4>\n<p>Once EPEL has been enabled on your <a title=\"Linux SSD Servers\" href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">linux server<\/a>, install OpenDKIM using the command below:<\/p>\n<pre>## yum install opendkim<\/pre>\n<p>and proceed with configuring it by renaming its default configuration to something like <code>\/etc\/opendkim.conf.orig<\/code> and adding the following to <code>\/etc\/opendkim.conf<\/code><\/p>\n<pre>## mv \/etc\/opendkim.conf{,.orig}\r\n## vim \/etc\/opendkim.conf<\/pre>\n<pre>AutoRestart             Yes\r\nAutoRestartRate         10\/1h\r\nLogWhy                  Yes\r\nSyslog                  Yes\r\nSyslogSuccess           Yes\r\nMode                    sv\r\nCanonicalization        relaxed\/simple\r\nExternalIgnoreList      refile:\/etc\/opendkim\/TrustedHosts\r\nInternalHosts           refile:\/etc\/opendkim\/TrustedHosts\r\nKeyTable                refile:\/etc\/opendkim\/KeyTable\r\nSigningTable            refile:\/etc\/opendkim\/SigningTable\r\nSignatureAlgorithm      rsa-sha256\r\nSocket                  inet:8891@localhost\r\nPidFile                 \/var\/run\/opendkim\/opendkim.pid\r\nUMask                   022\r\nUserID                  opendkim:opendkim\r\nTemporaryDirectory      \/var\/tmp<\/pre>\n<p>To learn more about <code>opendkim.conf<\/code> you can check <code>man opendkim.conf<\/code>.<\/p>\n<p>&nbsp;<\/p>\n<h4><b>SET-UP DKIM PUBLIC\/PRIVATE KEYS<\/b><\/h4>\n<p>Now generate a set of keys for your <code>mydomain.com<\/code> domain name using the commands below:<\/p>\n<pre>## mkdir \/etc\/opendkim\/keys\/mydomain.com\r\n## opendkim-genkey -D \/etc\/opendkim\/keys\/mydomain.com\/ -d mydomain.com -s default\r\n## chown -R opendkim: \/etc\/opendkim\/keys\/mydomain.com\r\n## mv \/etc\/opendkim\/keys\/mydomain.com\/default.private \/etc\/opendkim\/keys\/mydomain.com\/default<\/pre>\n<p>once the keys are generated, add <code>mydomain.com<\/code> to OpenDKIM\u2019s key table by adding the following record in <code>\/etc\/opendkim\/KeyTable<\/code><\/p>\n<pre>default._domainkey.mydomain.com mydomain.com:default:\/etc\/opendkim\/keys\/mydomain.com\/default<\/pre>\n<p>next, edit <code>\/etc\/opendkim\/SigningTable<\/code> and add the following record to OpenDKIM\u2019s signing table:<\/p>\n<pre>*@mydomain.com default._domainkey.mydomain.com<\/pre>\n<p>and add your domain and your hostname as trusted hosts in <code>\/etc\/opendkim\/TrustedHosts<\/code>:<\/p>\n<pre>127.0.0.1\r\nmydomain.com\r\nhost.mydomain.com<\/pre>\n<p><em>assuming the domain in question is &#8216;mydomain.com&#8217; and server&#8217;s hostname is set to &#8216;host.mydomain.com&#8217;<\/em><\/p>\n<p>finally, edit your <code>mydomain.com<\/code> DNS zone and add the TXT record from <code>\/etc\/opendkim\/keys\/mydomain.com\/default.txt<\/code><\/p>\n<pre>default._domainkey      IN      TXT     ( \"v=DKIM1; k=rsa; \"\r\n          \"p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDApHRr7ZmXRaAB+RQRbP4VdMwIrIHIP18KFtXRsv\/xpWc0Gix6ZXN13fcG03KNGKZo2PY+csPkGC5quDnH5V0JEhDZ78KcDWFsU6u4fr9ktVAdt6P7jWXjcyqdHOZ8+YN4cAeU4lRFNgQvdupIcByYwzPYMgBFHfJm9014HvRqhwIDAQAB\" )  ; ----- DKIM key default for mydomain.com<\/pre>\n<p>you can verify if your dkim TXT record is valid using <code>dig<\/code> for example:<\/p>\n<pre>## dig +short default._domainkey.mydomain.com TXT\r\n\r\n\"v=DKIM1\\; k=rsa\\; \" \"p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDApHRr7ZmXRaAB+RQRbP4VdMwIrIHIP18KFtXRsv\/xpWc0Gix6ZXN13fcG03KNGKZo2PY+csPkGC5quDnH5V0JEhDZ78KcDWFsU6u4fr9ktVAdt6P7jWXjcyqdHOZ8+YN4cAeU4lRFNgQvdupIcByYwzPYMgBFHfJm9014HvRqhwIDAQAB\"<\/pre>\n<p>&nbsp;<\/p>\n<h4><b>CONFIGURE EXIM<\/b><\/h4>\n<p>Now <strong>set-up Exim to use OpenDKIM<\/strong> for signing the emails by editing <code>\/etc\/exim\/exim.conf<\/code> and adding the following to the <code>remote_smtp<\/code> transport:<\/p>\n<pre>remote_smtp:\r\n        driver = smtp\r\n        dkim_domain = $sender_address_domain\r\n        dkim_selector = default\r\n        dkim_private_key = ${if exists{\/etc\/opendkim\/keys\/$sender_address_domain\/default}{\/etc\/opendkim\/keys\/$sender_address_domain\/default}{0}}\r\n        dkim_canon = relaxed\r\n        dkim_strict = 0<\/pre>\n<p>restart Exim and Opendkim for the changes to take effect using:<\/p>\n<pre>## systemctl restart exim\r\n## systemctl status exim\r\n\r\n## systemctl restart opendkim\r\n## systemctl status opendkim\r\n## systemctl enable opendkim<\/pre>\n<p>&nbsp;<\/p>\n<h4><b>LET US DO THIS FOR YOU?<\/b><\/h4>\n<p>Of course you don\u2019t have to do any of this if you use one of our <a title=\"Linux VPS Hosting\" href=\"https:\/\/www.rosehosting.com\/managed-vps-hosting.html\" target=\"_blank\" rel=\"noopener noreferrer\">Linux VPS Hosting<\/a> services, in which case you can simply ask our expert Linux admins to <strong>install and configure OpenDKIM with Exim<\/strong>. They are available 24&#215;7 and will take care of your request immediately.<\/p>\n<p><strong><span style=\"color: #ff0000;\">PS<\/span>.<\/strong> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article we will walk you through the steps of installing and configuring dkim with OpenDKIM and Exim on &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS\" class=\"read-more button\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-and-configure-dkim-with-opendkim-and-exim-on-a-centos-7-vps\/#more-5176\" aria-label=\"Read more about How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":2966,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1699,1706,13],"tags":[34,126,487,177,125,591],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS - 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