[Rspamd-Users] Disable DKIM signature for mailing lists

Stefan Bauer cubewerk at gmail.com
Tue Jul 7 19:21:40 UTC 2020

Hi Tim,

we did exactly what you've described but still break smime signed mails
with thid approach but dont see a solution to this.

Thinking if a sender signs mails to ML, he can not expect


Am Dienstag, 7. Juli 2020 schrieb Tim Cutts <tim at thecutts.org>:

> 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.
> Regards,
> Tim
> > 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
> --
> Users mailing list
> Users at lists.rspamd.com
> https://lists.rspamd.com/mailman/listinfo/users

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