Mail SNI: only allow subdomains of main domain, if cert is missing main domain

Version 1.57


Related to this change in 1.54.0: The contents of a valid certificate can still be added to the /etc/virtual/snidomains, if the main is missing from the certificate, but only if a subdomain of that domain exists in the certificate. As before, self-signed certificates are never allowed, into the snidomains file.

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