Hello, I try to send a mail with auth from the docker host but I get the error: Relay access denied

So I look the main.cf file and I see:
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.17.0.0/16
But the ip address of eth0 of container is 172.18.0.2 so is not in 172.17.0.0/16.

This is expected?

Thank