My Linux sever doesn't send emails out, the error message I am getting from gmail is:
Google tried to deliver your message, but it was rejected by the server for the recipient domain outbounds10.obsmtp.com by outbounds10.obsmtp.com. [22.214.171.124].
After checking Linux maillog, I sofrom email is @localhost.localdomain. before it was the machine name with the domain which was Linux.mydomain.com. but it is changed to default. see attachment.
How can I solve this please