Therefore, the email application sends a warning to the user that the name of the hosting server’s certificate has a mismatch with the domain name. If the user has used a private SSL setting for configuring their email application but using the domain name as the mail server, the application would expect the certificate to have the domain name. This error might appear in different forms, such as ‘invalid certificate,’ ‘hostname mismatch,’ ‘untrusted connection,’ etc. It indicates that the server’s SSL certificate fails to match the expected email application’s name. In such cases, one may use a different internet connection and try again.Įven when one is secured from cyber threats using phishing protection or ransomware protection as a part of the email security mechanism, one may encounter error messages related to a certificate name mismatch. It happens due to several failed attempts of login in a short span. If the issue continues even after 24 hours, examine if the local IP address is blacklisted.
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