[Dovecot] Copies of outgoing emails in the Sent folder

Hi!

My mail server works in tandem: Dovecot (IMAP) + Postfix. How can I configure in Gmail: Outgoing email copied to the Sent folder using postfix without mail client? This question is for the mailing list for Postfix? Mail client itself copies outgoing messages in the folder Sent, but the messages are large, and the server is far away. And to transmit email twice for sending and copying is not effective.

Sorry for my English ).

-- Regards Dmitry Podkovyrkin mobile: +7 922 20 56 756 email: dmirty@rutelecom.company skype: dmitryrw