How to prevent users from using Manage Identities on Java messaging V6?

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http://serverfault.com – In Thunderbird there is an option to Manage Identities which you can tell Thunderbird to use more than one identity per mail account. For example imagine you have email [email protected] and you want to hide/change your name/email then you can create other Identities like [email protected] I have tried this option with yahoo mail and it doesn't work I have message say: - An error occurred while sending mail. The mail server responded: From address not verified - see http://help.yahoo.com/l/us/mail/original/manage/sendfrom-07.html Please verify that your email address is correct in your Mail preferences (HowTos)