SMTP: Add option to override HELO/EHLO address
It would be good to have an option not to send the local hostname or LAN IP addresses in HELO, as it has no benefit in a client-server connection and is a small privacy leak.
When I like to send an e-mail from me@myprovider, the provider does not need to know that I am sending from "mybox1" with IP "192.168.0.1". Even when I trust my provider, many add this information as Received Header, and so it leaks to the recipient and all other servers.
My mail server cannot reach me anyway using this information, so it should be enough to send "localhost".