[Beowulf] Administrivia: emergency Mailman work for the Beowulf list

Discussion:

Christopher Samuel

2017-07-05 00:07:26 UTC

Hi all,

Someone sent a message from a site that uses DMARC last night and
consequently almost 500 subscribers had their subscriptions suspended as
DMARC requires sites to break the well understood semantics of the From:
header by rewriting it.

I'm about to install the latest backport of Mailman on beowulf.org which
will then allow me to automatically reject any DMARC'd emails to the
list as a quick fix.

Then I'll need to work out how to get the folks who got dropped back
onto the list. :-/

Sorry about this,
Chris

--
Christopher Samuel Senior Systems Administrator
Melbourne Bioinformatics - The University of Melbourne
Email: ***@unimelb.edu.au Phone: +61 (0)3 903 55545

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Christopher Samuel

2017-07-05 00:18:31 UTC

Permalink

Post by Christopher Samuel
I'm about to install the latest backport of Mailman on beowulf.org which
will then allow me to automatically reject any DMARC'd emails to the
list as a quick fix.

I've now completed this work, though with a slight modification.

Instead of blocking such emails I've instead told Mailman to rewrite the
From: address in the interests of keeping communications open.

Mailman *should* put their original email address into the Reply-To:
header instead so you should still be able to get back to the original
poster.

Thank you for your patience..

All the best,
Chris (now with 493 subscribers to fix up)

Christopher Samuel

2017-07-05 00:57:56 UTC

Permalink

Hi all,

The emergency work detailed below is now completed and 493 subscribers
have had their email re-enabled after it was disabled by bounces.

Users sending from sites that use DMARC will now have their From: header
rewritten to look like it comes to the list to stop this happening in
future, sorry about that.

All the best,
Chris

Post by Christopher Samuel
Hi all,
Someone sent a message from a site that uses DMARC last night and
consequently almost 500 subscribers had their subscriptions suspended as
header by rewriting it.
I'm about to install the latest backport of Mailman on beowulf.org which
will then allow me to automatically reject any DMARC'd emails to the
list as a quick fix.
Then I'll need to work out how to get the folks who got dropped back
onto the list. :-/
Sorry about this,
Chris