[Rspamd-Users] How to configure rspamd to never reject email?

[Jef Driesen]

On 28/03/2020 11:33, Jef Driesen wrote:
> I'm migrating from dspam (which is no longer maintained) to rspamd, and I'm
> running into a few issues.
> 
> My setup is a private mail server running dovecot and postfix. Unlike most
> public mail servers, it does not receive mail directly from the internet. Most
> email is retrieved with fetchmail from various external mailboxes. Thus,
> features like rejecting mail or greylisting makes no sense, because the mail has
> already been accepted elsewhere. How can I disable them? Basically I want to
> configure rspamd to only add headers and never reject any email. The headers are
> needed to move spam to the junk folder with a sieve script.
> 
> I also don't have a real domain name, and use a fake one (home.lan) on my
> internal network. Are there any other things I should watch out for in this kind
> of setup? Are there any modules that I should disable? My previous dspam based
> setup does only Bayesian classification, and not any of the more advanced
> features that rspamd supports.

I've noticed that in my setup legitimate emails get a higher spam score due to:

    FORGED_RECIPIENTS(2.00)[username at isp.tld,jef at home.lan];

I suspect that's because of my fake domain name? How can I avoid this?

The original recipient of the email is indeed username at isp.tld. After retrieving 
it with fetchmail from the mailbox at my ISP, it is delivered to my local 
mailserver as jef at home.lan:

Delivered-To: jef at home.lan
Received: from server.home.lan
	by server.home.lan with LMTP
	id xy6FBk1GiF4dWQAA4S2JrA
	(envelope-from <xxx at yyy.zz>)
	for <jef at home.lan>; Sat, 04 Apr 2020 10:33:17 +0200
Received: from server.home.lan (localhost [IPv6:::1])
	by server.home.lan (Postfix) with ESMTP id BAD522C7B
	for <jef at home.lan>; Sat,  4 Apr 2020 10:33:16 +0200 (CEST)
Received: from imap.isp.tld [xxx]
	by server.home.lan with IMAP (fetchmail-6.4.0.beta4)
	for <jef at home.lan> (single-drop); Sat, 04 Apr 2020 10:33:16 +0200 (CEST)

Do I need to whitelist my fake domain somehow to avoid this kind of problems?

Jef