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stop a message from sending altogether? Rated 5 out of 5 stars
hi gunter! have you given thought to if it would make sense to optionally not send the message with SMTP at all, then effectively you would have an in-folder conversation with no duplicates. this is a scenario with shared imap folders, where subscribed recipients are guaranteed to see the new messages without them arriving from internet.This review is for a previous version of the add-on (0.9.5).