{"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>

\"how-to-install-and-integrate-opendkim-with-postfix-on-a-centos-6-vps\"In this article we will walk you through the steps of installing and configuring dkim with OpenDKIM and Exim on a CentOS 7 SSD VPS<\/a><\/strong>.<\/p>\n

You should have a working mail server<\/a> setup with Exim<\/strong> before proceeding with this tutorial. Check our guide on how to set-up a mail server with Exim and Dovecot on a CentOS 7 VPS<\/a> if you don’t have setup a mail server yet.<\/p>\n

What is OpenDKIM?<\/strong><\/p>\n

OpenDKIM<\/a> is an open source implementation of the DKIM (Domain Keys Identified Mail<\/strong>) sender authentication system which is an email validation system designed to detect email spoofing<\/strong> by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain is authorized<\/strong> by that domain’s administrators. A digital signature<\/strong> included with the message can be validated<\/strong> by the recipient using the signer’s public key published in the DNS.<\/p>\n

<\/p>\n

 <\/p>\n

UPDATE THE SYSTEM<\/b><\/h4>\n

Before you start with the installation of OpenDKIM<\/strong>, ssh<\/code> to your server and initiate a screen<\/code> session using the command below:<\/p>\n

## screen -U -S exim-opendkim<\/pre>\n

once you’re in a screen<\/code> session, update your CentOS 7 VPS<\/a> using yum<\/code> as in:<\/p>\n

## yum update<\/pre>\n

 <\/p>\n

INSTALL SOME PACKAGES<\/b><\/h4>\n
## yum install curl wget vim openssl man<\/pre>\n

 <\/p>\n

ENABLE EPEL REPOSITORY<\/b><\/h4>\n

OpenDKIM is available in the EPEL (Extra Packages for Enterprise Linux) repositry, so let’s enable EPEL repository on the CentOS VPS<\/a> using:<\/p>\n

## yum install http:\/\/dl.fedoraproject.org\/pub\/epel\/7\/x86_64\/e\/epel-release-7-2.noarch.rpm<\/pre>\n

if you get a 404 not found, go at https:\/\/dl.fedoraproject.org\/pub\/epel\/7\/x86_64\/Packages\/e\/<\/a> and install the latest epel-release<\/code> rpm package available.<\/em><\/p>\n

next, check if EPEL has been enabled on your system using:<\/p>\n

## yum repolist<\/pre>\n

 <\/p>\n

INSTALL OPENDKIM<\/b><\/h4>\n

Once EPEL has been enabled on your linux server<\/a>, install OpenDKIM using the command below:<\/p>\n

## yum install opendkim<\/pre>\n

and proceed with configuring it by renaming its default configuration to something like \/etc\/opendkim.conf.orig<\/code> and adding the following to \/etc\/opendkim.conf<\/code><\/p>\n

## mv \/etc\/opendkim.conf{,.orig}\r\n## vim \/etc\/opendkim.conf<\/pre>\n
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

To learn more about opendkim.conf<\/code> you can check man opendkim.conf<\/code>.<\/p>\n

 <\/p>\n

SET-UP DKIM PUBLIC\/PRIVATE KEYS<\/b><\/h4>\n

Now generate a set of keys for your mydomain.com<\/code> domain name using the commands below:<\/p>\n

## 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

once the keys are generated, add mydomain.com<\/code> to OpenDKIM\u2019s key table by adding the following record in \/etc\/opendkim\/KeyTable<\/code><\/p>\n

default._domainkey.mydomain.com mydomain.com:default:\/etc\/opendkim\/keys\/mydomain.com\/default<\/pre>\n

next, edit \/etc\/opendkim\/SigningTable<\/code> and add the following record to OpenDKIM\u2019s signing table:<\/p>\n

*@mydomain.com default._domainkey.mydomain.com<\/pre>\n

and add your domain and your hostname as trusted hosts in \/etc\/opendkim\/TrustedHosts<\/code>:<\/p>\n

127.0.0.1\r\nmydomain.com\r\nhost.mydomain.com<\/pre>\n

assuming the domain in question is ‘mydomain.com’ and server’s hostname is set to ‘host.mydomain.com’<\/em><\/p>\n

finally, edit your mydomain.com<\/code> DNS zone and add the TXT record from \/etc\/opendkim\/keys\/mydomain.com\/default.txt<\/code><\/p>\n

default._domainkey      IN      TXT     ( \"v=DKIM1; k=rsa; \"\r\n          \"p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDApHRr7ZmXRaAB+RQRbP4VdMwIrIHIP18KFtXRsv\/xpWc0Gix6ZXN13fcG03KNGKZo2PY+csPkGC5quDnH5V0JEhDZ78KcDWFsU6u4fr9ktVAdt6P7jWXjcyqdHOZ8+YN4cAeU4lRFNgQvdupIcByYwzPYMgBFHfJm9014HvRqhwIDAQAB\" )  ; ----- DKIM key default for mydomain.com<\/pre>\n

you can verify if your dkim TXT record is valid using dig<\/code> for example:<\/p>\n

## dig +short default._domainkey.mydomain.com TXT\r\n\r\n\"v=DKIM1\\; k=rsa\\; \" \"p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDApHRr7ZmXRaAB+RQRbP4VdMwIrIHIP18KFtXRsv\/xpWc0Gix6ZXN13fcG03KNGKZo2PY+csPkGC5quDnH5V0JEhDZ78KcDWFsU6u4fr9ktVAdt6P7jWXjcyqdHOZ8+YN4cAeU4lRFNgQvdupIcByYwzPYMgBFHfJm9014HvRqhwIDAQAB\"<\/pre>\n

 <\/p>\n

CONFIGURE EXIM<\/b><\/h4>\n

Now set-up Exim to use OpenDKIM<\/strong> for signing the emails by editing \/etc\/exim\/exim.conf<\/code> and adding the following to the remote_smtp<\/code> transport:<\/p>\n

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

restart Exim and Opendkim for the changes to take effect using:<\/p>\n

## 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>\n

LET US DO THIS FOR YOU?<\/b><\/h4>\n

Of course you don\u2019t have to do any of this if you use one of our Linux VPS Hosting<\/a> services, in which case you can simply ask our expert Linux admins to install and configure OpenDKIM with Exim<\/strong>. They are available 24×7 and will take care of your request immediately.<\/p>\n

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":"

In this article we will walk you through the steps of installing and configuring dkim with OpenDKIM and Exim on … <\/p>\n

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":"\nHow to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS - RoseHosting<\/title>\n<meta name=\"description\" content=\"How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS - RoseHosting\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-and-configure-dkim-with-opendkim-and-exim-on-a-centos-7-vps\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS - RoseHosting\" \/>\n<meta property=\"og:description\" content=\"How to install and configure dkim with OpenDKIM and Exim on a CentOS 7 VPS - 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