[Mailman-Users] Emails lost due to receipient spam filters

Brian Carpenter brian at emwd.com
Thu Aug 28 16:26:19 CEST 2014

Hi Alan:

Are you aware of the DMARC issue that list owners are facing when allowing
Yahoo and AOL members to post to a list? Please see the following:


Are you using the From_Is_List option on the general options page? If you
are, what setting do you have it set to?

We were/are having issues emailing Gmail users when using the mung setting
so we are now instructing our mailman clients to use the "Wrap Message"
setting. Google considers any email that breaks the 5322 RFC standard to be
a violation of their best practices for sending bulk mail. Also you can use
the following form to talk to Google:



Here is their Bulk Senders Guidelines:


Brian Carpenter

Providing Cloud and Mailman hosting Services and more for many years.

T: 336.755.0685
E: brian at emwd.com


> -----Original Message-----
> From: Mailman-Users [mailto:mailman-users-
> bounces+brian=emwd.com at python.org] On Behalf Of Alan Meyer
> Sent: Thursday, August 28, 2014 2:58 AM
> To: Mailman-Users at python.org
> Subject: [Mailman-Users] Emails lost due to receipient spam filters
> Hi,
> I recently set up a Ubuntu 14.04 server with Mailman 2.1.16.  It took a
> for me to configure because I needed to modify the setup procedure from
> Ubuntu's instructions to what the mailman documentation suggested (no
> use of the postfix-to-mailman.py script).
> At any rate, my main goal has been to use mailman for an Indian Guides
> group, which for years has just been an email list of about 50
> people.  Mailman seemed like a great option to help ensure that all of the
> members are accounted for in each email and to have archives available.
> The problem that I'm having is that for some people on the list, they
> reliably get their emails.  Mostly, this is from members that are on
> or hotmail.com or in some cases ymail.com.  The "lost" emails get stuck in
> their spam filter, and in some cases hotmail users don't get their emails
at all.
> I did some testing with a practice list I created (sending to my own set
> yahoo, gmail accounts), where my yahoo account was sending to members
> on a gmail account.  I found no issue sending directly from yahoo to
> but from yahoo->mail list->gmail got caught in the gmail's spam filter. 
> gmail account spam folder would flag it and give me a note something to
> effect of "The sender's yahoo.com address could not be confirmed".
> Furthermore, in the gmail account, I can mark the email as "Not SPAM" but
> that doesn't help on subsequent emails.
> As an experiment, I changed a few settings (from default Yes to No), but
> these didn't seem to make a difference:
> - Should messages from this mailing list include the RFC 2369 (i.e.
> headers? Yes is highly recommended.
> - Should postings include the List-Post: header?
> - Should the Sender header be rewritten for this mailing list to avoid
> bounces? Yes is recommended.
> My search for SPAM hasn't helped (most SPAM issues are related to actual
> SPAM getting in from user accounts).
> Have others encountered this type of issue?  Are there any settings I can
> or steps I can take to help resolve this?
> Thanks in advance.
> Sincerely,
> -Alan
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