Hi there,
> -----Original Message-----
> On Wed, May 14, 2014 at 1:53 PM, L.W. van Braam van Vloten
> <[log in to unmask]> wrote, in part:
>
>
> I am analyzing the impact of the DMARC issue on my ListServ service
> (running on Linux).
>
> I am trying to determine if any Yahoo / AOL addresses have
> inadvertently been removed from any of my lists,
We have had 10s and 10s of people removed from one of our larger lists (tiny I suspect compared with some of you) because
Yahoo senders are posting to the list and we have a sizeable number of Hotmail subscribers, many of whom have been removed more than
once. That's the simple impact of DMARC and mailing lists.
Alan Thew
> ...
>
>
> You need to relearn "the DMARC issue". To get you started:
>
>
> * *Many* ISPs use DMARC, not just Yahoo and AOL.
> * The problem is that Yahoo and AOL have set their DMARC
> configuration so that it tells all DMARC ISPs to reject mail that has a "From:"
> address from them, but is being sent from someone else. This part is new.
> Please note that other ISPs may do this in the future!
>
> * Your Listserv server will distribute posts with a "From:" field of the
> poster, unless it has been upgraded to level set "16.0-2014a" (build date is 23
> April, 2014 for me).
> * Then, without the fix, if the "From:" field is Yahoo or AOL, you have
> the start of "the DMARC issue", as
>
> * All DMARC ISPs, not just Yahoo and AOL, will reject the
> distribution. Exactly how each implements "reject" varies.
> * Some will drop the distribution into the recipients' spam
> folder.
> * Many will return a "permanent" error suggesting the
> recipient does not exist.
> * Some will return a "permanent" error that tells you (or your
> list owner) of a DMARC problem.
> * If your lists have automatic deletion, sooner or later, Listserv
> will terminate the subscriptions of everyone that has returned a sufficient
> number of errors.
> * So, not only have your DMARC subscribers failed to receive
> distribution of posts made by Yahoo and AOL posters, but they will probably
> lose their subscriptions.
> * My lists that had Yahoo and AOL posters lost large numbers
> of subscribers before we caught and addressed the problem.
>
> * What to do? Upgrade to the recent Listserv level set asap. Once you
> have done that, "the DMARC issue" is behind you, not to bother you or your
> list owners and subscribers again.
>
> * Until you get Listserv upgraded, you probably want to avoid
> distributing posts where the "From:" field contains a Yahoo or AOL address.
> There are various ways to do this, but you won't like any of them.
>
>
> * How to tell if subscription deletions have taken place or are
> immanent? As Valdis suggests, this can be difficult.
>
> * If your lists have change logs, you have a record. Look at
> each change log for subscription deletions and the reason, as well as posts
> from Yahoo or AOL. If you don't have change logs, why not?
> * On Linux, subscribers being monitored are listed in a server
> file with extension ".autodel". Have a look; they are almost human readable.
> It helps to envision the format of the daily summary of errors a list owner can
> receive.
>
> Hope this helps!
>
> Cheers, Wayne
>
>
>
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