On Apr 27, 2015, at 2:14 PM, Elizabeth Zwicky via NANOG <nanog@nanog.org> wrote:

http://postmaster.yahoo.com will allow you to contact the postmaster team for assistance. I've reported this error already, but fixing it won't help you any; basically, the web page without the link is all Yahoo's willing to publicly say about that error message, you'll need to talk to postmaster for help debugging your particular situation. Elizabeth ZwickyYahoo Mail

If one cares to read it, fixing the link typo(s) gets me redirected to this link, which does work and does appear to be ToS info: https://policies.yahoo.com/xw/en/yahoo/terms/product-atos/comms/index.htm <https://policies.yahoo.com/xw/en/yahoo/terms/product-atos/comms/index.htm> -c