From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuri D'Elia Date: Wed, 21 May 2014 12:32:56 +0000 Subject: Re: [mlmmj] Dealing with DMARC - any out-of-the-box solution in sight? Message-Id: <537C9CF8.6020608@thregr.org> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: mlmmj@mlmmj.org On 05/21/2014 01:19 PM, Christian Lohmaier wrote: > Hi *, > > DMARC is in use by yahoo and others for a while, and gmail and others > already respect the settings, causing many bounces.... > > I wonder whether mlmmj will have some dmarc-compatible default soon or > how other mailinglist admins deal with the topic. > > Disallow all mail from dmarc-policy using senders? > Forward only (no footers, no list-tag, no body filtering... - and no > real solution with some SPF)? > Just replace from-address by "John Doe via "? > Replace From and add reply-to? > Replace From by forwarder-address? > > What have other mailinglistadmins done? > And what is the suggestion by mlmmj-devs? I'm currently removing DKIM and some obvious headers (using delheaders): DKIM-Signature: Return-Receipt-To: Disposition-Notification-To: X-Confirm-Reading-To: X-PMRQC: in order to bypass DKIM checks. It works if there's no DMARC, but I had no bounces from gmail users either. If I read the spec correctly, the only solution would be to replace From: with the list header (or a forwarder under the list domain) and add a Reply-To:. And of course, you cannot modify the body/subject if DKIM is in use. I don't like neither. The ability to choose reply-to-author/list is lost. Also, AFAIK there's no way to construct a Reply-To: automatically from the From: address in mlmmj. [sigh] I don't understand why the keep breaking mailing lists.... Though DMARC with SPF *only* seems reasonable enough, the biggest players all seem to use DKIM as well.