Force all webmail access through your custom domain to use HTTPS.
1. Log on to the domain management platform as an administrator. Go to Enterprise Customization > Domain Management > SSL Certificate Management.
2. Turn on the Force HTTPS switch.
Important
1. This switch applies only to the primary domain.
2. Once enabled, all webmail access through your custom domain uses HTTPS. Verify your SSL certificate is active by entering https://mail.your_domain_name in a browser.
3. The change may not take effect immediately. If so, try again in 3 hours.
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