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I've configured Thunderbird to place a copy of my sent emails in my remote "sent" folder of my Gmail account as opposed to the local thunderbird one. This ensures I can completely take advantage of my imap synchronization.
And so whenever I send an email, it first sends one to the address list, then it sends a new one to my sent box, however doing this with large attachments seems like a waste of time and bandwidth. Do you guys know of any extension or a combination of a trick plus a Gmail filter that could automate this in one step?