I can confirm that this is a Yahoo issue. I have a gmail acct, and only because my mail filters explicitly mark Calontir list email as not spam am I getting messages.

Xeno Belisarius
Alijah Ballard

On Fri, Apr 11, 2014 at 4:16 PM, Mark Schuldenfrei <[log in to unmask]> wrote:
On 4/11/2014 3:42 PM, Bill Ford's Hotmail wrote:
I got kicked off the list, too. I have a hotmail account. It said that I
was booted for “repeated delivery error  reports from  your mail
system”. I never got any error messages from my server, I regularly got
postings from the Calontir list. I think there may be a problem with the
Calontir list server itself.

Not Calontir, not your fault, Yahoo's Fault.


From The Risks Digest, Volume 27 issue 83

Yahoo breaks every mailing list in the world including the IETF's
Lauren Weinstein <[log in to unmask]>
Mon, 7 Apr 2014 15:35:50 -0700

http://j.mp/1e68Xlm  (IETF / John Levine via NNSquad)

  "The problem for mailing lists isn't limited to the Yahoo subscribers.
  Since Yahoo mail provokes bounces from lots of other mail systems,
  innocent subscribers at Gmail, Hotmail, etc. not only won't get Yahoo
  subscribers' messages, but all those bounces are likely to bounce
  them off the lists.  A few years back we had a similar problem due
  to an overstrict   implementation of DKIM ADSP, but in this
  case, DMARC is doing what Yahoo is telling it to do."