[ietf-dkim] MLMs and signatures again

[Murray S. Kucherawy]

> -----Original Message-----
> From: ietf-dkim-bounces at mipassoc.org [mailto:ietf-dkim-bounces at mipassoc.org] On Behalf Of Alessandro Vesely
> Sent: Friday, May 27, 2011 9:08 AM
> To: ietf-dkim at mipassoc.org
> Subject: Re: [ietf-dkim] MLMs and signatures again
> 
> > Certainly a possible feature, but it seems like it won't scale very
> > well.
> 
> Why not?  Of course, having a copy of each subscription record would
> roughly double the database, globally.  "Twice" is scalable, though.

An automated system to monitor mail flows to figure out lists to which users have subscribed or unsubscribed can't scale unless there are standards around how to do that, and everyone participates.  That's a high bar to set.

A manual system requires users to register lists they join or depart.  That's bound to be increasingly inaccurate over time.  And if every Gmail user subscribes to just two lists, that's an awfully large number of relationships to track and check on each message transiting their MTAs.

I could be wrong, but it sounds like a nightmare.