I have a server on which I host multiple domains. I recently installed a redmine installation underneath one of those domains. I set up the installation to send e-mails through sendmail. The e-mails are being sent, however, when they arrive in my gmail account, many of them are going straight to spam. I'm trying to lessen that likelihood. I noticed that they are described as being from "email@example.com" via "my-other-domain.com" where the second one is the domain for another site I have set up on this machine, and also happens to be the one listed in the /etc/hosts file. How can I remove that via portion? Also, does it affect the likelihood of my e-mail being judged as spam?