dovecot mailing list (this mailing list), DKIM, SPF and DMARC

[hi at zakaria.website]

On 2022-09-13 13:10, Benny Pedersen wrote:
> hi at zakaria.website skrev den 2022-09-13 14:03:
> 
>> least to must pass Signature Verification. Have anyone managed to
>> configure EXIM to verify more than one DKIM Signature header?
> 
> postfix smtpd_milter_maps with a list of ips that is known maillists 
> ips is best for software that are brokken, use DISABLE as results pr ip 
> that is maillist ips, that will disabled opendmarc and other milters 
> when client ip is a maillist, postfix be happy until trusted domain 
> have updated and stable milters
> 
> use rspamd if possible, with is imho the only stable milters with solve 
> it all, i hate to write that but it might be right for time being, 
> while spamassassin v4 is on the way

Another update yet with a solution.

I found the causing issue with DKIM and DMARC failure when a signed 
email pass through mailing list such as dovecot as I expected, it has 
nothing to do with the mailing list but it's to do with DKIM signing 
headers set. It's due to one of or several headers in the DKIM signing 
set, getting added or modified after signing at dovecot end.

Anyhow, here is the DKIM signing headers set in this mailing list, that 
it should work and it will prevent the batch of DMARC emails and bad 
signature from happening again.

from:from:reply-to:date:date:message-id:message-id:to:to:cc:
      mime-version:mime-version:content-type:content-type:
      in-reply-to:in-reply-to:references:references

Thanks to my friend who didnt need a credit, and helped me out in 
reaching this solution.

Zakaria.