And I get the following server log due to above operation:
Code:mail.SEND_ABORTED_ADDRESS_FAILURE Arg

invalid, STR, "my_email@hotmail.com")
Feb 19 17:43:07 chronos postfix/smtpd[21050]: NOQUEUE: reject: RCPT from chronos.mycompany.local[10.1.1.17]: 553 5.7.1 <my_login@mycompany.com>: Sender address rejected: not logged in; from=<my_login@mycompany.com> to=<my_email@hotmail.com> proto=ESMTP helo=<chronos.mycompany.local>