Thunderbird "Domain Name Mismatch" error

When using encryption to check or send email with Thunderbird, you may get a "Domain Name Mismatch" error.  If the error says that the certificate belongs to "", it is safe to ignore this error.  However, Thunderbird does not allow you to permanently accept the certificate.

One solution is to change the name of the incoming and outgoing mail servers to match the certificate.  This could cause problems if the CPanel account is moved to another server.

There is also an extension available for Thunderbird that adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Name Mismatch warning.  You can find information about this extension at

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