[Mailman-Users] cause of bounces

Mark Sapiro mark at msapiro.net
Wed Oct 18 19:10:02 EDT 2017

On 10/18/2017 03:41 PM, Jordan Brown wrote:
> On 10/18/2017 11:35 AM, Mark Sapiro wrote:
>> DMARC is not the problem. It is perfectly reasonable for say, irs.gov
>> to publish DMARC p=reject as long as mail From: irs.gov is not an
>> employees personal post to an email list. Presumably the IRS would
>> have rules against that.
> Would they?  Shouldn't IRS sysadmins who use Mailman in the course of
> their jobs send messages to this mailing list using their @irs.gov
> addresses?
> Not all submissions to public mailing lists are personal use.

Agreed, but for DMARC to work seamlessly with pre-existing accepted
norms, DMARC policies of reject or quarantine should only be published
for domains that send "official" mail directly to end recipients.

If irs.gov published such a policy (currently it publishes p=none) and
IRS employees needed to post From: some irs.gov address, they could
easily post From: @subdomain.irs.gov and publish p=none for that subdomain.

However, all this is really moot because whatever any of us thinks,
DMARC is already being used in ways that disrupt pre-existing accepted
norms so for mailing lists to remain viable, they have to mitigate the
effects in some way.

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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