Adding a mail domain to ISPmanager.

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Attention! Fulfill conditions before starting.
The domain name must be directed to the hosting DNS. During the mail domain setup, DNS records will be automatically added and a Let's Encrypt certificate will be issued for the mail.domain.com alias.
Log in to your ISPmanager Control Panel, "Mail/Mail Domains" part and click "Create mail domain". Specify the domain name in the "Name" line and the IP address in the "IP address" line.
Leave the "Default Action" option unchanged.
Enable the "Greylisting", "SpamAssassin" and "Virus Scanning" options.
Enable "DKIM" and "DMARC" and leave unchanged. Scroll down on the same page.
Enable the "Secure connection (SSL)" option.
Enter your email domain alias "mail.yourdomain".
You need to select "New Let's Encrypt certificate" to secure the connection in the "SSL certificate" line.
Correct certificate issuance requires you to enter your Client Area email in the "Email" field.
Click "OK" The panel will redirect you to the certificate request page. Click "OK".