About "received" header when using Dovecot proxy

[Riku via dovecot]

Hello.
My name is Riku.

Currently, I use Dovecot as a proxy for another SMTP server.
However, this seems to cause the IP address of the "received" header to be that 
of the proxy server.
Is it possible to change this so that the IP address of the sender is entered?
The version of Dovecot is "2.3.8 (9df20d2db)".
Sorry for the incomprehensible explanation.

Thank you.

 Best regards.