@Adam I'm using a smarthost for email.
I added the server hostname website in order to be able to define an spf record for the server itself (to authorize webservers when an app sends email using the webserver, the webserver sends the email to the smarthost and the email isn't caught by SPF lacking the webservers IP)
Being this an email server only role, I'll remove it.
Sorry for suggesting it was update related.
Thanks!