[Mailman-Users] "Bounce action notification" emails for subscribes/unsubscribes

Mark Sapiro mark at msapiro.net
Tue Oct 24 20:25:30 EDT 2017

On 10/24/2017 06:06 AM, Jim Popovitch wrote:
> I'm jumping in late here.. Is the problem possibly DMARC alignment
> failures?  If so, I've been working on a patch for this:

No. This has nothing to do with DMARC. However your branch might be

The issue is that owner notifications from Mailman are sent with
envelope from the sitelist-bounces address in the list's domain. In
cPanel this results in the envelope being from mailman-bounces at list.domain.

cPanel's Exim configuration apparently only sees this as a valid address
if a list named mailman_list.domain exists which it doesn't. There is
only one 'mailman' list and its name is maybe just 'mailman' or maybe
'mailman_some_canonical_host_name', I'm not sure which but probably the
former, but there isn't a separate 'mailman_list.domain' list for every
list domain.

So then Exim is configured to do sender verification and
mailman-bounces at list.domain is not a valid address as far as Exim is
concerned so these owner notifications are bounced by Exim and never sent.

The workaround that Terry and others have implemented is to make an
alias for mailman-bounces at list.domain which, cPanel's opinion to the
contrary notwithstanding, I believe is the correct solution as it is the
only way the domain admin is going to see any real bounces.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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