[sylpheed:36594] Gmail and sent messages

[Андрей]

How to stop puts sent messages in Sent Mail folder if The Gmail IMAP server  already puts sent messages in Sent Mail by itself?
This takes some time, especially if the message is large or a weak communication channel is used.

I know that i can turn off the corresponding option in General preferences, but i have more three non-gmail accounts, which not stored sent messages in Sent Mail (Outbox) without this options.
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Best regards, Mikhail