Feature wishlist: Allow to hide client IP/host in submission service

[Timo Sirainen]

On 25 Aug 2019, at 21.51, Sebastian Krause via dovecot <dovecot at dovecot.org> wrote:
> 
> Hi,
> 
> In many mail setups a required feature (for privacy reasons) is to
> hide the host and IP of clients (in the "Received" header) that use
> the authenticated submission over port 587. In Postfix that's
> possible (https://serverfault.com/q/413533/86332), but not very nice
> to configure especially if you only want want to strip the Received
> header for port 587 submissions, but not on port 25.
> 
> As far as I can see this configuration is not possible at all in the
> Dovecot submission server because the function which adds the
> Received header with the client's IP address
> (smtp_server_transaction_write_trace_record) is always called in
> submission-commands.c.
> 
> It would be very useful if the submission server could anonymize the
> client with a single configuration option, then all the Postfix
> configuration mess (and using SASL) could be skipped by simply using
> the Dovecot submission server instead.

Yeah, it would be useful to hide the client's IP and do it by default. Actually I think there shouldn't even be an option to not hide it. Or would it be better or worse to just not have the Received header added at all?