[Rspamd-Users] Disable DKIM signature for mailing lists

Marc Roos M.Roos at f1-outsourcing.eu
Wed Jul 8 08:01:50 UTC 2020

Hi Tim,

Interesting to read how mailman is offering this service. I was 
wondering how organisations like ebay are relaying email and prevent 
people from having direct contact. I tried searching for it a while ago 
but could not really find something, how are these systems even called? 
Do you know if it is possible to realize something based on eg. 

-----Original Message-----
From: Tim Cutts [mailto:tim at thecutts.org] 
Sent: dinsdag 7 juli 2020 20:24
To: users at lists.rspamd.com
Subject: Re: [Rspamd-Users] Disable DKIM signature for mailing lists

DKIM and SPF are fundamentally fairly hostile to mailing lists.  There 
are some gross hacks to get around it; I run a number of Mailman list 
servers, and the solution mailman offers is to strip out any incoming 
DKIM signatures, re-write the headers so that the mail appears to come 
from the list server itself, and then re-signs with new DKIM headers.  
That fixes both DKIM and SPF problems from the forwarded emails.  In 
other words, they’re not really forwarded at all, but new emails with 
fresh signatures.  The downside is the recipients can no longer reply 
direct to the sender of the email.

I realise this doesn’t fix your problem, but it’s probably worth 
educating the list owners if you know them.



> On 7 Jul 2020, at 17:12, Ihor Antonov <ihor at antonovs.family> wrote:
> Hi,
> A lot of mailing lists forward emails and thus ruin my DKIM signature.
> My Inbox fills in with MAILER-DAEMON reports about DKIM signature 
mismatch when, all of them from recipients who got my message through 
some mailing list.
> I wonder if there is an easy way to configure Rspamd to NOT sign 
outgoing emails if it is being sent to a mailing list?
> I don't mind maintaining the list of exemptions manually.
> Thanks!
> Ihor Antonov
> --
> Users mailing list
> Users at lists.rspamd.com
> https://lists.rspamd.com/mailman/listinfo/users

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