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

Brian Carpenter brian at emwd.com
Thu Aug 28 19:22:36 CEST 2014

> -----Original Message-----
> From: Peter Shute [mailto:pshute at nuw.org.au]
> Sent: Thursday, August 28, 2014 1:07 PM
> To: Brian Carpenter
> Cc: Alan Meyer; Mailman-Users at python.org
> Subject: Re: [Mailman-Users] Emails lost due to receipient spam filters
> > On 29 Aug 2014, at 1:25 am, "Brian Carpenter" <brian at emwd.com> wrote:
> >
> > 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
> > the following form to talk to Google:
> What were the gmail issues, Brian? We're using munging on yahoo and aol
> messages, and haven't seen any problems so far, apart from inconsistent
> Reply All behaviour of some mail clients.
> Peter Shute

Sporadic blocking from Gmail's mail servers but with no error message. Since
Google considers breaking 5322 a bad practice, I am guessing that using mung
may be related to these random blocking. But I am guessing but since
recommending to our clients on our mailman servers, to start using "wrap
message" via the Sender Filters page, we have seen Gmail delivery
improvements and on some servers, the random blocking has cleared up
entirely. I have submitted a ticket with Google but am still waiting to hear
back from them so hopefully I will get a definitive answer to what was going

Brian Carpenter

Providing Cloud Services and more for over 15 years.

T: 336.755.0685
E: brian at emwd.com

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