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ALL To CC BCC
This Thunderbird add-on allows you to automatically complete the TO, CC and BCC fields...
Contacts Add BCC button
Contacts Add BCC button is an extension which adds a Add to BCC button to contacts panel on the compose window....
Bccthis for Gmail
Allows users to compose private, secure messages...
MSH Free Autoresponder
Sendmail and Postfix milter plugin that allows you to create auto responses....