I have set up sendmail on my Ubuntu web server to send mail from our website.
But lots of servers are rejecting mail like this:
SMTP; 550 Access denied - Invalid HELO name
I have only my hostname "genius" in my /etc/hostname file - I believe this is correct for ubuntu?
So how do I get sendmail to "HELO" my FQDN?
It does show in my mail headers, but clearly not in my HELO
Also, how can I see what my HELO is?
PS. These look correct?
root@genius:~# hostname --fqdn