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How to connect mail client to Web-Hosting if domain uses 3rd party DNS
Preconditions: Your domain is hosted on Regery Web-Hosting and Plesk panel is used for management. 3rd party (Cloudflare) DNS nameservers are used. All resource records are correctly copied from Plesk resource records editor to Cloudflare. Steps in Plesk control panel: In Plesk control panel go to Websites & Domains and click Add Subdomain. Specify mail. subdomain, check Secure the domain with Let's Encrypt checkbox and proceed with subdomain creation.