{"id":13498,"date":"2026-04-19T03:42:59","date_gmt":"2026-04-19T03:42:59","guid":{"rendered":"https:\/\/zoomdang.com\/?p=13498"},"modified":"2026-04-19T05:25:26","modified_gmt":"2026-04-19T05:25:26","slug":"set-up-docker-mailserver-in-coolify","status":"publish","type":"post","link":"https:\/\/zoomdang.com\/index.php\/2026\/04\/19\/set-up-docker-mailserver-in-coolify\/","title":{"rendered":"Set up Docker-Mailserver in Coolify"},"content":{"rendered":"

Required Environment Variables:<\/b><\/p>\n

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  • \n

    SSL_TYPE=letsencrypt<\/code><\/p>\n<\/li>\n

  • \n

    ENABLE_DNS_CHALLENGE=1<\/code><\/p>\n<\/li>\n

  • \n

    DNS_PROVIDER=dns_cf<\/code><\/p>\n<\/li>\n

  • \n

    PROVIDER_CONFIG=CF_Token=<\/code><\/p>\n<\/li>\n

  • OVERRIDE_HOSTNAME=mail.zoomdang.com<\/code><\/li>\n<\/ul>\n

    You must get a cloudflare API token. Go to cloudflare, generate an account API tokens, give permission to editi zone DNS for the specific domain.<\/p>\n

    Docker-Mailserver often crashes if it doesn’t find a certificate folder before the challenge finishes. We solved this by:<\/p>\n

      \n
    1. \n

      Creating the folder manually on the host: \/mail_certificate\/live\/mail.zoomdang.com<\/code>.<\/p>\n<\/li>\n

    2. \n

      Mounting it directly: \/mail_certificate:\/etc\/letsencrypt:rw<\/code>.<\/p>\n<\/li>\n

    3. \n

      Adding ONE_DIR=1<\/code> to the environment to ensure persistence.<\/p>\n<\/li>\n<\/ol>\n

      Remember to do port forwarding in local router<\/strong><\/p>\n<\/div>