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One way to confirm the rejection of the class textplain from JavaMail API due to a VerifyError is to check the error logs or console output of the application that is using the JavaMail API. The VerifyError message should indicate that the class textplain could not be verified, and may provide additional information about the cause of the error. Additionally, running the code in a debugger can help pinpoint where the error occurred and investigate any underlying issues. It is also important to ensure that the JavaMail API version being used is compatible with the Java version and platform being used.