{"id":5889,"date":"2026-06-18T11:10:14","date_gmt":"2026-06-18T11:10:14","guid":{"rendered":"https:\/\/cheapsslweb.com\/resources\/?p=5889"},"modified":"2026-06-18T11:10:16","modified_gmt":"2026-06-18T11:10:16","slug":"how-to-install-an-acme-ssl-certificate-on-mail-servers","status":"publish","type":"post","link":"https:\/\/cheapsslweb.com\/resources\/how-to-install-an-acme-ssl-certificate-on-mail-servers\/","title":{"rendered":"How to Install an ACME SSL Certificate on Mail Servers?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">To ensure that email communications remain secure, we must secure email communications to ensure that user credentials are kept secure from being compromised as well as email contents being secure and preventing mail servers from getting blacklisted. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike web servers, which only support HTTP, mail servers support multiple protocols including SMTP, IMAP, and POP3, making it very difficult to configure SSL on them. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The easiest way to automate the process of issuing\/renewing SSL certificates is to use an ACME Client to communicate with Commercial Certificate Authorities (CAs) such as DigiCert, Sectigo, etc., using the ACME External Account Binding (EAB) method to <a href=\"https:\/\/cheapsslweb.com\/acme\/sectigo-acme-ssl-certificate\">obtain SSL certificates from a CA<\/a> that complies with the ACME method.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following document will provide instructions for how to install ACME SSL certificates on a mail server using either Postfix (SMTP), Dovecot (IMAP), or Exim (POP3) mail protocols in a production-ready environment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Requirements<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Prior to beginning, please confirm:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You have a domain name (example: mail.abc.com) pointing to your mail server.<\/li>\n\n\n\n<li>You have an MX record set on your domain.<\/li>\n\n\n\n<li>You have root-level access (via SSH) to the mail server.<\/li>\n\n\n\n<li>You have installed Postfix or Exim and Dovecot on your mail server.<\/li>\n\n\n\n<li>You have ACME user credentials established.<ul><li>ACME directory URL<\/li><li>EAB Key ID<\/li><li>EAB HMAC Key<\/li>\n<\/ul><\/li>\n<\/ul>\n\n\n<\/p>\n<p>\n\n\n<h2 class=\"wp-block-heading\">Steps for Installing ACME SSL Cert on Your Mail Server<\/h2>\n\n\n<\/p>\n<p>\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Step 1: Install acme.sh on Your Mail Server<\/h3>\n\n\n<\/p>\n<p>\n\n\n<p class=\"wp-block-paragraph\">The first step is to install the ACME client using the acme.sh script on your mail server so you can use it locally to complete the creation of your certificate and automate the renewal of your certificate.&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>curl https:\/\/get.acme.sh | sh \nsource ~\/.bashrc\nacme.sh --version <\/code><\/pre>\n\n\n<\/p>\n<p>\n\n\n<p class=\"wp-block-paragraph\">Before moving on, verify the ACME client&#8217;s functionality with the command shown below; if this command fails, verify that you have installed all required tools like curl on your system or re-login to your Mail Server so you can re-load your environmental variables.&nbsp;<\/p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\">Step 2: Register Your ACME Account (with EAB)<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">In the second task, you will use your <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-acme-external-account-binding-eab\/\">EAB credentials<\/a> to register your server with the Certificate Authority (CA). By doing this, you have connected the ACME Client to the SSL Provider.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>acme.sh --register-account \\\n\u00a0--server https:\/\/acme.yourca.com\/v2\/acme \\\n\u00a0--eab-kid YOUR_EAB_KID \\\n\u00a0--eab-hmac-key YOUR_EAB_HMAC_KEY \\\n\u00a0--accountemail admin@example.com<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Please note<\/strong> that you should replace any text that appears in the documentation as a \u2018placeholder\u2019 with actual values that identify your specific situation. You will only need to do this once and will then be able to use this connection to make requests for SSL Certificates from your CA in the future.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\">Step 3: Issue the Certificate Using DNS-01 Validation<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Most mail servers don&#8217;t support HTTP, so they usually use the DNS-01 verification method, which allows you to verify your ownership of the domain using a DNS TXT record.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>acme.sh --issue \\\n\u00a0-d mail.example.com \\\n\u00a0--dns dns_manual \\\n\u00a0--server https:\/\/acme.yourca.com\/v2\/acme<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">When you execute the command below, <strong>acme.sh will create a TXT record for you to add to your DNS panel<\/strong>:<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Name:<\/strong> _acme-challenge.mail.example.com<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Value: <\/strong>&lt;provided-token><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Verify it using:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>dig TXT _acme-challenge.mail.example.com +short<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Re-run the command after verifying the TXT record you created above*. <strong>The certificate will be created and stored here:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>~\/.acme.sh\/mail.example.com\/<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\">Step 4: Configure Postfix (SMTP) to Use the Certificate<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Now configure Postfix to use the issued certificate for secure SMTP communication.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>First, Copy the Certificate Files to a Stable Location:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo mkdir -p \/etc\/ssl\/mail\nsudo cp ~\/.acme.sh\/mail.example.com\/fullchain.cer \/etc\/ssl\/mail\/mail-fullchain.cer\nsudo cp ~\/.acme.sh\/mail.example.com\/mail.example.com.key \/etc\/ssl\/mail\/mail.key\nsudo chmod 600 \/etc\/ssl\/mail\/mail.key<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Then Configure Postfix:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo postconf -e 'smtpd_use_tls = yes'\nsudo postconf -e 'smtpd_tls_security_level = may'\nsudo postconf -e 'smtpd_tls_cert_file = \/etc\/ssl\/mail\/mail-fullchain.cer'\nsudo postconf -e 'smtpd_tls_key_file = \/etc\/ssl\/mail\/mail.key'\nsudo postconf -e 'smtp_tls_security_level = may'<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Restart Postfix:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo systemctl restart postfix<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">This enables encrypted SMTP connections for sending and receiving mail.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\"><a><\/a>Step 5: Configure Dovecot (IMAP\/POP3)<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Dovecot handles mailbox access via IMAP and POP3. You need to point it to the same certificate files.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Edit the SSL Configuration:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/dovecot\/conf.d\/10-ssl.conf<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Update:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>ssl = yes\nssl_cert = &lt;\/etc\/ssl\/mail\/mail-fullchain.cer\nssl_key\u00a0 = &lt;\/etc\/ssl\/mail\/mail.key<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Restart Dovecot:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo systemctl restart dovecot<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Now your IMAP\/POP3 services are secured with TLS.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\"><a><\/a>Step 6: Configure Exim (Optional)<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">If you use Exim instead of Postfix, configure TLS similarly:<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>tls_certificate = \/etc\/ssl\/mail\/mail-fullchain.cer\ntls_privatekey\u00a0 = \/etc\/ssl\/mail\/mail.key<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Restart Exim:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>sudo systemctl restart exim4<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\"><a><\/a>Step 7: Test Your Mail Server SSL<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">After configuration, verify your SSL setup using OpenSSL.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Test SMTP:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>openssl s_client -starttls smtp -connect mail.example.com:587 -showcerts<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Test IMAP:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>openssl s_client -starttls imap -connect mail.example.com:143 -showcerts<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">The installation of your service is complete once you obtain a certificate from a trusted (reputable) Certificate Authority (CA) concerning the validity of both your domain and the CA.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h3 class=\"wp-block-heading\"><a><\/a>Step 8: Automate Renewal and Service Reload<\/h3>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">To automate the certificate renewal and reload the Email Services when your certificates are renewed, run the following:<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Run this command to reload the Email Services after a certificate has been renewed.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">The Automatic renewals happen automatically, but after an account certificate has been renewed, you still need to reload the Email Services.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Create a deploy Script:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>#!\/usr\/bin\/env bash\nDOMAIN=\"mail.example.com\"\nSRC=\"$HOME\/.acme.sh\/$DOMAIN\"\nDEST=\"\/etc\/ssl\/mail\"\nsudo cp \"$SRC\/fullchain.cer\" \"$DEST\/mail-fullchain.cer\"\nsudo cp \"$SRC\/$DOMAIN.key\" \"$DEST\/mail.key\"\nsudo chmod 600 \"$DEST\/mail.key\"\nsudo systemctl restart postfix dovecot<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\"><strong>Then link it with acme.sh:<\/strong><\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<pre class=\"wp-block-code\"><code>acme.sh --install-cert -d mail.example.com \\\n\u00a0--key-file\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ~\/.acme.sh\/mail.example.com\/mail.example.com.key \\\n\u00a0--fullchain-file ~\/.acme.sh\/mail.example.com\/fullchain.cer \\\n\u00a0--reloadcmd \"\/path\/to\/deploy-script.sh\"<\/code><\/pre>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">Automatic updates and application of certificates are ensured.<\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">To properly deploy and convert an SSL certificate, you must be using a reputable certificate authority (CA) that has been established and trusted for many years. <\/p>\n<p>\n\n\n<\/p>\n<p>\n\n\n<\/p>\n<p class=\"wp-block-paragraph\">CheapSSLweb offers a complete enterprise-class package of <a href=\"https:\/\/cheapsslweb.com\/ssl-certificate-automation\">inexpensive ACME SSL Certificates<\/a> from top-tier commercial partners such as DigiCert and Sectigo, and provides complete technical support for all ACME or EAB environments with an end-to-end suite of SSL Certificate Services.<\/p>\n<p>\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"<p>To ensure that email communications remain secure, we must secure email communications to ensure that user credentials are kept secure from being compromised as well as email contents being secure and preventing mail servers from getting blacklisted. Unlike web servers, which only support HTTP, mail servers support multiple protocols including SMTP, IMAP, and POP3, making<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-install-an-acme-ssl-certificate-on-mail-servers\/\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":5890,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568],"tags":[578,577],"class_list":["post-5889","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-automation","tag-acme-ssl-for-mail-servers","tag-mail-server-ssl-automation","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Install and Auto Renew ACME SSL Certificates on Mail Servers<\/title>\n<meta name=\"description\" content=\"Learn how to deploy and automatically 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