The mail client finds the root mail certificate of the server, which was generated for (where is the domain of the provider).You configure the mail client using (where is your domain).To explain in simpler terms what happens is this: This error becomes less and less common as mail clients are improved and support SNI properly. The problem is that mail servers don’t support/support correctly SNI technology, that’s why you can get “mail certificate” error in some cases.Īs I said the Apple mail client performs tighter checks, which in some cases give us the error “server identity verification error”. SNI has changed, giving the possibility to install more than one SSL certificate on the same IP address, with a system called server name indication. Initially, it was possible to install an SSL certificate only if you had a dedicated IP, so one certificate per IP.
The cause of the error is due to SNI, or server name indication.
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