smtpd_client_restrictions for local mail and Google Gmail only

Question

I'm using Gmail as a spam filter, whereby it forwards mail to hendry@example.com and I use mutt to read my email.

However hendry@example.com accepts mail from everyone currently, so I want to restrict what it accepts to just Google gmail servers. Any recipes for that?

Answer 1

You can use the restriction check_client_access for this purpose. But you'll need to know the IP address or at least an IP address range of GMail's SMTP hosts to make it work.