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HTTPS for Zoho Mail Custom Domain

Published:
NOTE: You need a server with nginx setup to proxy your custom domain to Zoho.

  1. Point your custom domain to the server with nginx installed using DNS A Record

    A         mail         [your-ip-address]

  2. Configure nginx to proxy pass to Zoho

    server {
    listen 80;
    server_name mail.your-domain.com;
    location / {
	proxy_pass https://mail.zoho.com/biz/customlogin?rd=your-domain.com;
}

  3. Obtain SSL certificate with Certbot

    apt-get install software-properties-common
add-apt-repository ppa:certbot/certbot
apt-get update
apt-get install python-certbot-nginx
apt-get install python-certbot-nginx
certbot --nginx
nginx -t
systemctl restart nginx

  4. Wait for DNS changes to propagate.