[Linux-aus] PSA: Messages sent through LA mailing lists being classified as SPAM

Russell Coker russell at coker.com.au
Fri Jan 15 00:13:51 AEDT 2016

On Thu, 14 Jan 2016 09:09:59 PM Joel W. Shea wrote:
> > [...] OpenDKIM uses tabs and both OpenDKIM and libmail-dkim-perl
> > expect tabs when it receives mail, Mailman refolds it with spaces
> > instead and those programs can't validate the mail (I'm not aware of
> > any DKIM checker that accepts spaces). [...]
> Although I haven't tested directly, I believe Mailman may only break
> DKIM signatures where the canonicalization method is "simple" (rather
> than "relaxed"), unfortunately this is both the default setting for
> OpenDKIM, and also where it's not explicitly specified in the header.

That appears to be the case.  One other thing to note is that most people 
don't know how to configure these things.  When we discussed this issue on the 
LUV list no-one pointed out how to solve it.

> > If you use the from_is_list feature then messages will have the
> > following change: -From: Russell Coker <russell at coker.com.au> +From:
> > Russell Coker via linux-aus <linux-aus at lists.linux.org.au>
> Please DO NOT set from_is_list, as this will annoy users, use
> dmarc_moderation_action instead. (as below)

dmarc_moderation_action means that you will have 2 styles of message being 
sent out and enough of them will be modified that people who's MUAs can't 
thread such messages will have almost every thread broken.

> > Then the Linux Australia server can sign the messages with it's own
> > DKIM signature.
> Do you still need to re-write the From: header just to sign a message?

No.  But if you want to have DMARC pass then you have to do it.

> > Last year I implemented from_is_list on the LUV lists.  There were a
> > number of complaints from people who don't like the aesthetics of it.
> > [...]
> It's not simply a matter of aesthetics, but of RFC compliance.

Given a choice between mail being falsely treated as spam and a technicality 
of an RFC I'll choose to avoid good mail going to the spam folder every time.

The fact that you advocate for dmarc_moderation_action indicates that you 
don't really believe in sticking to that RFC issue.

My Main Blog         http://etbe.coker.com.au/
My Documents Blog    http://doc.coker.com.au/

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