This is one common Postfix error when setting up mail accounts. You receive a message with subject: “Undelivered Mail Returned to Sender” and you find the following lines in its content:
The mail system
: mail for chrfisioterapia.com loops back to myself
It’s weird, but it occurs when the e-mail MX server points to our server, we may have added the virtual mailbox or alias but we have not added the corresponding line to the mydestination directive in /etc/postfix/main.cf so we must add our domain there.
mydestination = localhost totaki.com mydomain.com
Then, just restart or reload postfix and the error must be gone. (You must re-send the emails).