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→Show warning when making To vs BCC mistake
A simple warning dialog could help people from making this mistake which can
have negative consequences.
== Better Integration with ldap address book server==
It might be helpful to have an interface to show address book entries from a ldap server, and not only autocompleting from this type of server.
The ldap contacts sidebar bar (http://extensions.sanjer.nl/?page=tb_cs) look a very good example to follow but it doesn't work very well with thunderbird 3 (it works ok with thunderbird 2).