Hi!

It looks like Steve had the same issue, and so he included a solution under ATTENTION! READ THIS…. I’ll copy them here:

1. Edit /etc/mail/sendmail.mc and add the following lines at the end:

   define(`MAIL_HUB', `domain.com.')dnl
   define(`LOCAL_RELAY', `domain.com.')dnl
   

   Make sure you including the trailing dot!

2. Run sendmailconfig so that the changes take effect, and restart sendmail just to be 100% sure:

   sudo sendmailconfig  
   sudo service sendmail restart
   

Once you’ve done that, try sending an email to the same domain and you should see sendmail connecting to your domain’s incoming mailserver(s) in the log file.